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Finding the Fourth Proportional to 714.85, 1,071.47 and 454.21

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Solution

The fourth proportional to 714.85, 1,071.47 and 454.21 is: 680.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.85 : 1,071.47 = 454.21 : x
  2. Step 2: Convert to fraction form
    714.85/1,071.47 = 454.21/x
  3. Step 3: Cross multiply
    714.85x = 1,071.47 × 454.21
  4. Step 4: Simplify right side
    714.85x = 486,670.12
  5. Step 5: Solve for x
    x = 486,670.12/714.85
  6. Step 6: Final answer
    x = 680.80

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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.