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Finding the Fourth Proportional to 28,043.55, 42,065.28 and 8,321.91

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Solution

The fourth proportional to 28,043.55, 42,065.28 and 8,321.91 is: 12,482.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,043.55 : 42,065.28 = 8,321.91 : x
  2. Step 2: Convert to fraction form
    28,043.55/42,065.28 = 8,321.91/x
  3. Step 3: Cross multiply
    28,043.55x = 42,065.28 × 8,321.91
  4. Step 4: Simplify right side
    28,043.55x = 350,063,474.28
  5. Step 5: Solve for x
    x = 350,063,474.28/28,043.55
  6. Step 6: Final answer
    x = 12,482.85

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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.