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Finding the Fourth Proportional to 129,012.80, 178,037.84 and 72,424.58

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Solution

The fourth proportional to 129,012.80, 178,037.84 and 72,424.58 is: 99,946.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,012.80 : 178,037.84 = 72,424.58 : x
  2. Step 2: Convert to fraction form
    129,012.80/178,037.84 = 72,424.58/x
  3. Step 3: Cross multiply
    129,012.80x = 178,037.84 × 72,424.58
  4. Step 4: Simplify right side
    129,012.80x = 12,894,315,341.01
  5. Step 5: Solve for x
    x = 12,894,315,341.01/129,012.80
  6. Step 6: Final answer
    x = 99,946.02

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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.