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Finding the Fourth Proportional to 438.06, 657.48 and 391.71

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Solution

The fourth proportional to 438.06, 657.48 and 391.71 is: 587.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.06 : 657.48 = 391.71 : x
  2. Step 2: Convert to fraction form
    438.06/657.48 = 391.71/x
  3. Step 3: Cross multiply
    438.06x = 657.48 × 391.71
  4. Step 4: Simplify right side
    438.06x = 257,541.49
  5. Step 5: Solve for x
    x = 257,541.49/438.06
  6. Step 6: Final answer
    x = 587.91

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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.