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Finding the Fourth Proportional to 38,752.80, 58,139.10 and 12,457.80

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Solution

The fourth proportional to 38,752.80, 58,139.10 and 12,457.80 is: 18,689.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,752.80 : 58,139.10 = 12,457.80 : x
  2. Step 2: Convert to fraction form
    38,752.80/58,139.10 = 12,457.80/x
  3. Step 3: Cross multiply
    38,752.80x = 58,139.10 × 12,457.80
  4. Step 4: Simplify right side
    38,752.80x = 724,285,279.98
  5. Step 5: Solve for x
    x = 724,285,279.98/38,752.80
  6. Step 6: Final answer
    x = 18,689.88

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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.