Home / 21,123.20-31,761.60-20,662.40

Finding the Fourth Proportional to 21,123.20, 31,761.60 and 20,662.40

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Solution

The fourth proportional to 21,123.20, 31,761.60 and 20,662.40 is: 31,068.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,123.20 : 31,761.60 = 20,662.40 : x
  2. Step 2: Convert to fraction form
    21,123.20/31,761.60 = 20,662.40/x
  3. Step 3: Cross multiply
    21,123.20x = 31,761.60 × 20,662.40
  4. Step 4: Simplify right side
    21,123.20x = 656,270,883.84
  5. Step 5: Solve for x
    x = 656,270,883.84/21,123.20
  6. Step 6: Final answer
    x = 31,068.72

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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.