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Finding the Fourth Proportional to 643.92, 888.12 and 457.22

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Solution

The fourth proportional to 643.92, 888.12 and 457.22 is: 630.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.92 : 888.12 = 457.22 : x
  2. Step 2: Convert to fraction form
    643.92/888.12 = 457.22/x
  3. Step 3: Cross multiply
    643.92x = 888.12 × 457.22
  4. Step 4: Simplify right side
    643.92x = 406,061.79
  5. Step 5: Solve for x
    x = 406,061.79/643.92
  6. Step 6: Final answer
    x = 630.61

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Double scale
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1.5x scale

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.