Home / 20,876.13-31,314.20-9,780.75

Finding the Fourth Proportional to 20,876.13, 31,314.20 and 9,780.75

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Solution

The fourth proportional to 20,876.13, 31,314.20 and 9,780.75 is: 14,671.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,876.13 : 31,314.20 = 9,780.75 : x
  2. Step 2: Convert to fraction form
    20,876.13/31,314.20 = 9,780.75/x
  3. Step 3: Cross multiply
    20,876.13x = 31,314.20 × 9,780.75
  4. Step 4: Simplify right side
    20,876.13x = 306,276,312.75
  5. Step 5: Solve for x
    x = 306,276,312.75/20,876.13
  6. Step 6: Final answer
    x = 14,671.13

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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.