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Finding the Fourth Proportional to 72,496.80, 99,818.24 and 65,853.78

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Solution

The fourth proportional to 72,496.80, 99,818.24 and 65,853.78 is: 90,671.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,496.80 : 99,818.24 = 65,853.78 : x
  2. Step 2: Convert to fraction form
    72,496.80/99,818.24 = 65,853.78/x
  3. Step 3: Cross multiply
    72,496.80x = 99,818.24 × 65,853.78
  4. Step 4: Simplify right side
    72,496.80x = 6,573,408,087.68
  5. Step 5: Solve for x
    x = 6,573,408,087.68/72,496.80
  6. Step 6: Final answer
    x = 90,671.70

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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.