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Finding the Fourth Proportional to 85,006.80, 128,146.86 and 79,297.92

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Solution

The fourth proportional to 85,006.80, 128,146.86 and 79,297.92 is: 119,540.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,006.80 : 128,146.86 = 79,297.92 : x
  2. Step 2: Convert to fraction form
    85,006.80/128,146.86 = 79,297.92/x
  3. Step 3: Cross multiply
    85,006.80x = 128,146.86 × 79,297.92
  4. Step 4: Simplify right side
    85,006.80x = 10,161,779,452.53
  5. Step 5: Solve for x
    x = 10,161,779,452.53/85,006.80
  6. Step 6: Final answer
    x = 119,540.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.