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Finding the Fourth Proportional to 99,602.70, 149,404.05 and 87,938.70

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Solution

The fourth proportional to 99,602.70, 149,404.05 and 87,938.70 is: 131,908.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,602.70 : 149,404.05 = 87,938.70 : x
  2. Step 2: Convert to fraction form
    99,602.70/149,404.05 = 87,938.70/x
  3. Step 3: Cross multiply
    99,602.70x = 149,404.05 × 87,938.70
  4. Step 4: Simplify right side
    99,602.70x = 13,138,397,931.74
  5. Step 5: Solve for x
    x = 13,138,397,931.74/99,602.70
  6. Step 6: Final answer
    x = 131,908.05

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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.