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Finding the Fourth Proportional to 6,390.30, 9,585.45 and 6,347.10

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Solution

The fourth proportional to 6,390.30, 9,585.45 and 6,347.10 is: 9,520.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,390.30 : 9,585.45 = 6,347.10 : x
  2. Step 2: Convert to fraction form
    6,390.30/9,585.45 = 6,347.10/x
  3. Step 3: Cross multiply
    6,390.30x = 9,585.45 × 6,347.10
  4. Step 4: Simplify right side
    6,390.30x = 60,839,809.70
  5. Step 5: Solve for x
    x = 60,839,809.70/6,390.30
  6. Step 6: Final answer
    x = 9,520.65

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.