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Finding the Fourth Proportional to 387.93, 535.05 and 256.71

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Solution

The fourth proportional to 387.93, 535.05 and 256.71 is: 354.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.93 : 535.05 = 256.71 : x
  2. Step 2: Convert to fraction form
    387.93/535.05 = 256.71/x
  3. Step 3: Cross multiply
    387.93x = 535.05 × 256.71
  4. Step 4: Simplify right side
    387.93x = 137,352.69
  5. Step 5: Solve for x
    x = 137,352.69/387.93
  6. Step 6: Final answer
    x = 354.07

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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.