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Finding the Fourth Proportional to 714.48, 1,071.92 and 390.07

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Solution

The fourth proportional to 714.48, 1,071.92 and 390.07 is: 585.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.48 : 1,071.92 = 390.07 : x
  2. Step 2: Convert to fraction form
    714.48/1,071.92 = 390.07/x
  3. Step 3: Cross multiply
    714.48x = 1,071.92 × 390.07
  4. Step 4: Simplify right side
    714.48x = 418,123.83
  5. Step 5: Solve for x
    x = 418,123.83/714.48
  6. Step 6: Final answer
    x = 585.21

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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.