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Finding the Fourth Proportional to 387.15, 534.10 and 255.99

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Solution

The fourth proportional to 387.15, 534.10 and 255.99 is: 353.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.15 : 534.10 = 255.99 : x
  2. Step 2: Convert to fraction form
    387.15/534.10 = 255.99/x
  3. Step 3: Cross multiply
    387.15x = 534.10 × 255.99
  4. Step 4: Simplify right side
    387.15x = 136,724.26
  5. Step 5: Solve for x
    x = 136,724.26/387.15
  6. Step 6: Final answer
    x = 353.16

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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.