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Finding the Fourth Proportional to 99,212.80, 148,934.40 and 57,126.40

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Solution

The fourth proportional to 99,212.80, 148,934.40 and 57,126.40 is: 85,755.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,212.80 : 148,934.40 = 57,126.40 : x
  2. Step 2: Convert to fraction form
    99,212.80/148,934.40 = 57,126.40/x
  3. Step 3: Cross multiply
    99,212.80x = 148,934.40 × 57,126.40
  4. Step 4: Simplify right side
    99,212.80x = 8,508,086,108.16
  5. Step 5: Solve for x
    x = 8,508,086,108.16/99,212.80
  6. Step 6: Final answer
    x = 85,755.93

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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.