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Finding the Fourth Proportional to 28,280.76, 42,381.02 and 20,826.76

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Solution

The fourth proportional to 28,280.76, 42,381.02 and 20,826.76 is: 31,210.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,280.76 : 42,381.02 = 20,826.76 : x
  2. Step 2: Convert to fraction form
    28,280.76/42,381.02 = 20,826.76/x
  3. Step 3: Cross multiply
    28,280.76x = 42,381.02 × 20,826.76
  4. Step 4: Simplify right side
    28,280.76x = 882,659,332.10
  5. Step 5: Solve for x
    x = 882,659,332.10/28,280.76
  6. Step 6: Final answer
    x = 31,210.59

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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.