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Finding the Fourth Proportional to 387.76, 534.04 and 385.60

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Solution

The fourth proportional to 387.76, 534.04 and 385.60 is: 531.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.76 : 534.04 = 385.60 : x
  2. Step 2: Convert to fraction form
    387.76/534.04 = 385.60/x
  3. Step 3: Cross multiply
    387.76x = 534.04 × 385.60
  4. Step 4: Simplify right side
    387.76x = 205,925.82
  5. Step 5: Solve for x
    x = 205,925.82/387.76
  6. Step 6: Final answer
    x = 531.07

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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.