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Finding the Fourth Proportional to 99,456.40, 149,729.02 and 90,747.28

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Solution

The fourth proportional to 99,456.40, 149,729.02 and 90,747.28 is: 136,617.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,456.40 : 149,729.02 = 90,747.28 : x
  2. Step 2: Convert to fraction form
    99,456.40/149,729.02 = 90,747.28/x
  3. Step 3: Cross multiply
    99,456.40x = 149,729.02 × 90,747.28
  4. Step 4: Simplify right side
    99,456.40x = 13,587,501,302.07
  5. Step 5: Solve for x
    x = 13,587,501,302.07/99,456.40
  6. Step 6: Final answer
    x = 136,617.67

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.