Home / 28,156.71-42,289.74-20,731.85

Finding the Fourth Proportional to 28,156.71, 42,289.74 and 20,731.85

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Solution

The fourth proportional to 28,156.71, 42,289.74 and 20,731.85 is: 31,138.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,156.71 : 42,289.74 = 20,731.85 : x
  2. Step 2: Convert to fraction form
    28,156.71/42,289.74 = 20,731.85/x
  3. Step 3: Cross multiply
    28,156.71x = 42,289.74 × 20,731.85
  4. Step 4: Simplify right side
    28,156.71x = 876,744,334.77
  5. Step 5: Solve for x
    x = 876,744,334.77/28,156.71
  6. Step 6: Final answer
    x = 31,138.02

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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.