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Finding the Fourth Proportional to 129,498.87, 178,684.74 and 72,136.77

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Solution

The fourth proportional to 129,498.87, 178,684.74 and 72,136.77 is: 99,535.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,498.87 : 178,684.74 = 72,136.77 : x
  2. Step 2: Convert to fraction form
    129,498.87/178,684.74 = 72,136.77/x
  3. Step 3: Cross multiply
    129,498.87x = 178,684.74 × 72,136.77
  4. Step 4: Simplify right side
    129,498.87x = 12,889,739,991.89
  5. Step 5: Solve for x
    x = 12,889,739,991.89/129,498.87
  6. Step 6: Final answer
    x = 99,535.54

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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.