Home / 28,711.10-42,981.60-21,348.20

Finding the Fourth Proportional to 28,711.10, 42,981.60 and 21,348.20

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Solution

The fourth proportional to 28,711.10, 42,981.60 and 21,348.20 is: 31,959.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,711.10 : 42,981.60 = 21,348.20 : x
  2. Step 2: Convert to fraction form
    28,711.10/42,981.60 = 21,348.20/x
  3. Step 3: Cross multiply
    28,711.10x = 42,981.60 × 21,348.20
  4. Step 4: Simplify right side
    28,711.10x = 917,579,793.12
  5. Step 5: Solve for x
    x = 917,579,793.12/28,711.10
  6. Step 6: Final answer
    x = 31,959.06

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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.