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Finding the Fourth Proportional to 386.57, 529.85 and 372.71

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Solution

The fourth proportional to 386.57, 529.85 and 372.71 is: 510.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.57 : 529.85 = 372.71 : x
  2. Step 2: Convert to fraction form
    386.57/529.85 = 372.71/x
  3. Step 3: Cross multiply
    386.57x = 529.85 × 372.71
  4. Step 4: Simplify right side
    386.57x = 197,480.39
  5. Step 5: Solve for x
    x = 197,480.39/386.57
  6. Step 6: Final answer
    x = 510.85

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.