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Finding the Fourth Proportional to 387.47, 534.65 and 256.65

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Solution

The fourth proportional to 387.47, 534.65 and 256.65 is: 354.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.47 : 534.65 = 256.65 : x
  2. Step 2: Convert to fraction form
    387.47/534.65 = 256.65/x
  3. Step 3: Cross multiply
    387.47x = 534.65 × 256.65
  4. Step 4: Simplify right side
    387.47x = 137,216.64
  5. Step 5: Solve for x
    x = 137,216.64/387.47
  6. Step 6: Final answer
    x = 354.14

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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.