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Finding the Fourth Proportional to 714.38, 985.84 and 403.88

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Solution

The fourth proportional to 714.38, 985.84 and 403.88 is: 557.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.38 : 985.84 = 403.88 : x
  2. Step 2: Convert to fraction form
    714.38/985.84 = 403.88/x
  3. Step 3: Cross multiply
    714.38x = 985.84 × 403.88
  4. Step 4: Simplify right side
    714.38x = 398,155.12
  5. Step 5: Solve for x
    x = 398,155.12/714.38
  6. Step 6: Final answer
    x = 557.35

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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.