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Finding the Fourth Proportional to 707.90, 1,061.28 and 322.88

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Solution

The fourth proportional to 707.90, 1,061.28 and 322.88 is: 484.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.90 : 1,061.28 = 322.88 : x
  2. Step 2: Convert to fraction form
    707.90/1,061.28 = 322.88/x
  3. Step 3: Cross multiply
    707.90x = 1,061.28 × 322.88
  4. Step 4: Simplify right side
    707.90x = 342,660.78
  5. Step 5: Solve for x
    x = 342,660.78/707.90
  6. Step 6: Final answer
    x = 484.06

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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.