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Finding the Fourth Proportional to 667.14, 920.99 and 457.70

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Solution

The fourth proportional to 667.14, 920.99 and 457.70 is: 631.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.14 : 920.99 = 457.70 : x
  2. Step 2: Convert to fraction form
    667.14/920.99 = 457.70/x
  3. Step 3: Cross multiply
    667.14x = 920.99 × 457.70
  4. Step 4: Simplify right side
    667.14x = 421,534.83
  5. Step 5: Solve for x
    x = 421,534.83/667.14
  6. Step 6: Final answer
    x = 631.85

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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.