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Finding the Fourth Proportional to 384.72, 531.53 and 291.79

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Solution

The fourth proportional to 384.72, 531.53 and 291.79 is: 403.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.72 : 531.53 = 291.79 : x
  2. Step 2: Convert to fraction form
    384.72/531.53 = 291.79/x
  3. Step 3: Cross multiply
    384.72x = 531.53 × 291.79
  4. Step 4: Simplify right side
    384.72x = 155,095.14
  5. Step 5: Solve for x
    x = 155,095.14/384.72
  6. Step 6: Final answer
    x = 403.14

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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.