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Finding the Fourth Proportional to 666.50, 920.49 and 457.22

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Solution

The fourth proportional to 666.50, 920.49 and 457.22 is: 631.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.50 : 920.49 = 457.22 : x
  2. Step 2: Convert to fraction form
    666.50/920.49 = 457.22/x
  3. Step 3: Cross multiply
    666.50x = 920.49 × 457.22
  4. Step 4: Simplify right side
    666.50x = 420,868.74
  5. Step 5: Solve for x
    x = 420,868.74/666.50
  6. Step 6: Final answer
    x = 631.46

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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.