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Finding the Fourth Proportional to 91,453.76, 136,765.92 and 90,313.28

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Solution

The fourth proportional to 91,453.76, 136,765.92 and 90,313.28 is: 135,060.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,453.76 : 136,765.92 = 90,313.28 : x
  2. Step 2: Convert to fraction form
    91,453.76/136,765.92 = 90,313.28/x
  3. Step 3: Cross multiply
    91,453.76x = 136,765.92 × 90,313.28
  4. Step 4: Simplify right side
    91,453.76x = 12,351,778,827.42
  5. Step 5: Solve for x
    x = 12,351,778,827.42/91,453.76
  6. Step 6: Final answer
    x = 135,060.37

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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.