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Finding the Fourth Proportional to 438.51, 656.39 and 392.13

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Solution

The fourth proportional to 438.51, 656.39 and 392.13 is: 586.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.51 : 656.39 = 392.13 : x
  2. Step 2: Convert to fraction form
    438.51/656.39 = 392.13/x
  3. Step 3: Cross multiply
    438.51x = 656.39 × 392.13
  4. Step 4: Simplify right side
    438.51x = 257,388.25
  5. Step 5: Solve for x
    x = 257,388.25/438.51
  6. Step 6: Final answer
    x = 586.96

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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.