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Finding the Fourth Proportional to 707.66, 1,061.12 and 317.60

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Solution

The fourth proportional to 707.66, 1,061.12 and 317.60 is: 476.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.66 : 1,061.12 = 317.60 : x
  2. Step 2: Convert to fraction form
    707.66/1,061.12 = 317.60/x
  3. Step 3: Cross multiply
    707.66x = 1,061.12 × 317.60
  4. Step 4: Simplify right side
    707.66x = 337,011.71
  5. Step 5: Solve for x
    x = 337,011.71/707.66
  6. Step 6: Final answer
    x = 476.23

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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.