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Finding the Fourth Proportional to 99,139.68, 148,709.60 and 81,572.58

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Solution

The fourth proportional to 99,139.68, 148,709.60 and 81,572.58 is: 122,358.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,139.68 : 148,709.60 = 81,572.58 : x
  2. Step 2: Convert to fraction form
    99,139.68/148,709.60 = 81,572.58/x
  3. Step 3: Cross multiply
    99,139.68x = 148,709.60 × 81,572.58
  4. Step 4: Simplify right side
    99,139.68x = 12,130,625,742.77
  5. Step 5: Solve for x
    x = 12,130,625,742.77/99,139.68
  6. Step 6: Final answer
    x = 122,358.94

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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.