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Finding the Fourth Proportional to 707.20, 1,061.71 and 382.79

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Solution

The fourth proportional to 707.20, 1,061.71 and 382.79 is: 574.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.20 : 1,061.71 = 382.79 : x
  2. Step 2: Convert to fraction form
    707.20/1,061.71 = 382.79/x
  3. Step 3: Cross multiply
    707.20x = 1,061.71 × 382.79
  4. Step 4: Simplify right side
    707.20x = 406,417.09
  5. Step 5: Solve for x
    x = 406,417.09/707.20
  6. Step 6: Final answer
    x = 574.69

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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.