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Finding the Fourth Proportional to 20,819.60, 31,243.80 and 14,980.40

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Solution

The fourth proportional to 20,819.60, 31,243.80 and 14,980.40 is: 22,480.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,819.60 : 31,243.80 = 14,980.40 : x
  2. Step 2: Convert to fraction form
    20,819.60/31,243.80 = 14,980.40/x
  3. Step 3: Cross multiply
    20,819.60x = 31,243.80 × 14,980.40
  4. Step 4: Simplify right side
    20,819.60x = 468,044,621.52
  5. Step 5: Solve for x
    x = 468,044,621.52/20,819.60
  6. Step 6: Final answer
    x = 22,480.96

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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.