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Finding the Fourth Proportional to 291.78, 437.70 and 99.42

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Solution

The fourth proportional to 291.78, 437.70 and 99.42 is: 149.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.78 : 437.70 = 99.42 : x
  2. Step 2: Convert to fraction form
    291.78/437.70 = 99.42/x
  3. Step 3: Cross multiply
    291.78x = 437.70 × 99.42
  4. Step 4: Simplify right side
    291.78x = 43,516.13
  5. Step 5: Solve for x
    x = 43,516.13/291.78
  6. Step 6: Final answer
    x = 149.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.