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Finding the Fourth Proportional to 72,393.68, 99,900.60 and 42,180.68

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Solution

The fourth proportional to 72,393.68, 99,900.60 and 42,180.68 is: 58,207.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,393.68 : 99,900.60 = 42,180.68 : x
  2. Step 2: Convert to fraction form
    72,393.68/99,900.60 = 42,180.68/x
  3. Step 3: Cross multiply
    72,393.68x = 99,900.60 × 42,180.68
  4. Step 4: Simplify right side
    72,393.68x = 4,213,875,240.41
  5. Step 5: Solve for x
    x = 4,213,875,240.41/72,393.68
  6. Step 6: Final answer
    x = 58,207.78

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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.