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Finding the Fourth Proportional to 438.93, 656.94 and 421.92

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Solution

The fourth proportional to 438.93, 656.94 and 421.92 is: 631.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.93 : 656.94 = 421.92 : x
  2. Step 2: Convert to fraction form
    438.93/656.94 = 421.92/x
  3. Step 3: Cross multiply
    438.93x = 656.94 × 421.92
  4. Step 4: Simplify right side
    438.93x = 277,176.12
  5. Step 5: Solve for x
    x = 277,176.12/438.93
  6. Step 6: Final answer
    x = 631.48

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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.