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Finding the Fourth Proportional to 99,079.45, 136,729.65 and 56,638.90

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Solution

The fourth proportional to 99,079.45, 136,729.65 and 56,638.90 is: 78,161.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,079.45 : 136,729.65 = 56,638.90 : x
  2. Step 2: Convert to fraction form
    99,079.45/136,729.65 = 56,638.90/x
  3. Step 3: Cross multiply
    99,079.45x = 136,729.65 × 56,638.90
  4. Step 4: Simplify right side
    99,079.45x = 7,744,216,587.59
  5. Step 5: Solve for x
    x = 7,744,216,587.59/99,079.45
  6. Step 6: Final answer
    x = 78,161.68

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1.5x scale

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.