Home / 20,780.24-31,129.20-9,671.60

Finding the Fourth Proportional to 20,780.24, 31,129.20 and 9,671.60

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Solution

The fourth proportional to 20,780.24, 31,129.20 and 9,671.60 is: 14,488.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,780.24 : 31,129.20 = 9,671.60 : x
  2. Step 2: Convert to fraction form
    20,780.24/31,129.20 = 9,671.60/x
  3. Step 3: Cross multiply
    20,780.24x = 31,129.20 × 9,671.60
  4. Step 4: Simplify right side
    20,780.24x = 301,069,170.72
  5. Step 5: Solve for x
    x = 301,069,170.72/20,780.24
  6. Step 6: Final answer
    x = 14,488.24

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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.