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Finding the Fourth Proportional to 129,157.77, 178,230.87 and 72,565.50

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Solution

The fourth proportional to 129,157.77, 178,230.87 and 72,565.50 is: 100,136.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,157.77 : 178,230.87 = 72,565.50 : x
  2. Step 2: Convert to fraction form
    129,157.77/178,230.87 = 72,565.50/x
  3. Step 3: Cross multiply
    129,157.77x = 178,230.87 × 72,565.50
  4. Step 4: Simplify right side
    129,157.77x = 12,933,412,196.99
  5. Step 5: Solve for x
    x = 12,933,412,196.99/129,157.77
  6. Step 6: Final answer
    x = 100,136.54

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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.