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Finding the Fourth Proportional to 85,390.92, 128,366.58 and 79,225.38

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Solution

The fourth proportional to 85,390.92, 128,366.58 and 79,225.38 is: 119,098.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,390.92 : 128,366.58 = 79,225.38 : x
  2. Step 2: Convert to fraction form
    85,390.92/128,366.58 = 79,225.38/x
  3. Step 3: Cross multiply
    85,390.92x = 128,366.58 × 79,225.38
  4. Step 4: Simplify right side
    85,390.92x = 10,169,891,079.80
  5. Step 5: Solve for x
    x = 10,169,891,079.80/85,390.92
  6. Step 6: Final answer
    x = 119,098.04

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1.5x scale

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.