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Finding the Fourth Proportional to 385.47, 531.85 and 287.06

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Solution

The fourth proportional to 385.47, 531.85 and 287.06 is: 396.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.47 : 531.85 = 287.06 : x
  2. Step 2: Convert to fraction form
    385.47/531.85 = 287.06/x
  3. Step 3: Cross multiply
    385.47x = 531.85 × 287.06
  4. Step 4: Simplify right side
    385.47x = 152,668.77
  5. Step 5: Solve for x
    x = 152,668.77/385.47
  6. Step 6: Final answer
    x = 396.06

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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.