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Finding the Fourth Proportional to 714.78, 1,070.80 and 421.66

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Solution

The fourth proportional to 714.78, 1,070.80 and 421.66 is: 631.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.78 : 1,070.80 = 421.66 : x
  2. Step 2: Convert to fraction form
    714.78/1,070.80 = 421.66/x
  3. Step 3: Cross multiply
    714.78x = 1,070.80 × 421.66
  4. Step 4: Simplify right side
    714.78x = 451,513.53
  5. Step 5: Solve for x
    x = 451,513.53/714.78
  6. Step 6: Final answer
    x = 631.68

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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.