Home / 21,187.20-31,780.80-16,281.60

Finding the Fourth Proportional to 21,187.20, 31,780.80 and 16,281.60

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Solution

The fourth proportional to 21,187.20, 31,780.80 and 16,281.60 is: 24,422.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,187.20 : 31,780.80 = 16,281.60 : x
  2. Step 2: Convert to fraction form
    21,187.20/31,780.80 = 16,281.60/x
  3. Step 3: Cross multiply
    21,187.20x = 31,780.80 × 16,281.60
  4. Step 4: Simplify right side
    21,187.20x = 517,442,273.28
  5. Step 5: Solve for x
    x = 517,442,273.28/21,187.20
  6. Step 6: Final answer
    x = 24,422.40

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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.