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Finding the Fourth Proportional to 99,905.70, 149,129.75 and 87,294.22

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Solution

The fourth proportional to 99,905.70, 149,129.75 and 87,294.22 is: 130,304.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,905.70 : 149,129.75 = 87,294.22 : x
  2. Step 2: Convert to fraction form
    99,905.70/149,129.75 = 87,294.22/x
  3. Step 3: Cross multiply
    99,905.70x = 149,129.75 × 87,294.22
  4. Step 4: Simplify right side
    99,905.70x = 13,018,164,768.57
  5. Step 5: Solve for x
    x = 13,018,164,768.57/99,905.70
  6. Step 6: Final answer
    x = 130,304.53

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.