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Finding the Fourth Proportional to 714.30, 1,071.43 and 454.78

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Solution

The fourth proportional to 714.30, 1,071.43 and 454.78 is: 682.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.30 : 1,071.43 = 454.78 : x
  2. Step 2: Convert to fraction form
    714.30/1,071.43 = 454.78/x
  3. Step 3: Cross multiply
    714.30x = 1,071.43 × 454.78
  4. Step 4: Simplify right side
    714.30x = 487,264.94
  5. Step 5: Solve for x
    x = 487,264.94/714.30
  6. Step 6: Final answer
    x = 682.16

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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.