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Finding the Fourth Proportional to 384.95, 531.02 and 291.74

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Solution

The fourth proportional to 384.95, 531.02 and 291.74 is: 402.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.95 : 531.02 = 291.74 : x
  2. Step 2: Convert to fraction form
    384.95/531.02 = 291.74/x
  3. Step 3: Cross multiply
    384.95x = 531.02 × 291.74
  4. Step 4: Simplify right side
    384.95x = 154,917.85
  5. Step 5: Solve for x
    x = 154,917.85/384.95
  6. Step 6: Final answer
    x = 402.43

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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.