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Finding the Fourth Proportional to 9,015.65, 12,439.46 and 5,478.65

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Solution

The fourth proportional to 9,015.65, 12,439.46 and 5,478.65 is: 7,559.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,015.65 : 12,439.46 = 5,478.65 : x
  2. Step 2: Convert to fraction form
    9,015.65/12,439.46 = 5,478.65/x
  3. Step 3: Cross multiply
    9,015.65x = 12,439.46 × 5,478.65
  4. Step 4: Simplify right side
    9,015.65x = 68,151,357.94
  5. Step 5: Solve for x
    x = 68,151,357.94/9,015.65
  6. Step 6: Final answer
    x = 7,559.23

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.