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Finding the Fourth Proportional to 387.90, 535.14 and 240.71

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Solution

The fourth proportional to 387.90, 535.14 and 240.71 is: 332.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.90 : 535.14 = 240.71 : x
  2. Step 2: Convert to fraction form
    387.90/535.14 = 240.71/x
  3. Step 3: Cross multiply
    387.90x = 535.14 × 240.71
  4. Step 4: Simplify right side
    387.90x = 128,810.87
  5. Step 5: Solve for x
    x = 128,810.87/387.90
  6. Step 6: Final answer
    x = 332.07

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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.