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Finding the Fourth Proportional to 6,865.88, 9,479.81 and 5,428.10

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Solution

The fourth proportional to 6,865.88, 9,479.81 and 5,428.10 is: 7,494.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,865.88 : 9,479.81 = 5,428.10 : x
  2. Step 2: Convert to fraction form
    6,865.88/9,479.81 = 5,428.10/x
  3. Step 3: Cross multiply
    6,865.88x = 9,479.81 × 5,428.10
  4. Step 4: Simplify right side
    6,865.88x = 51,457,282.12
  5. Step 5: Solve for x
    x = 51,457,282.12/6,865.88
  6. Step 6: Final answer
    x = 7,494.64

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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.