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Finding the Fourth Proportional to 38,752.40, 58,128.60 and 12,459.80

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Solution

The fourth proportional to 38,752.40, 58,128.60 and 12,459.80 is: 18,689.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,752.40 : 58,128.60 = 12,459.80 : x
  2. Step 2: Convert to fraction form
    38,752.40/58,128.60 = 12,459.80/x
  3. Step 3: Cross multiply
    38,752.40x = 58,128.60 × 12,459.80
  4. Step 4: Simplify right side
    38,752.40x = 724,270,730.28
  5. Step 5: Solve for x
    x = 724,270,730.28/38,752.40
  6. Step 6: Final answer
    x = 18,689.70

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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.