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Finding the Fourth Proportional to 99,170.76, 136,821.45 and 63,381.72

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Solution

The fourth proportional to 99,170.76, 136,821.45 and 63,381.72 is: 87,444.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,170.76 : 136,821.45 = 63,381.72 : x
  2. Step 2: Convert to fraction form
    99,170.76/136,821.45 = 63,381.72/x
  3. Step 3: Cross multiply
    99,170.76x = 136,821.45 × 63,381.72
  4. Step 4: Simplify right side
    99,170.76x = 8,671,978,833.89
  5. Step 5: Solve for x
    x = 8,671,978,833.89/99,170.76
  6. Step 6: Final answer
    x = 87,444.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.