Home / 28,000.20-38,640.20-15,424.95

Finding the Fourth Proportional to 28,000.20, 38,640.20 and 15,424.95

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Solution

The fourth proportional to 28,000.20, 38,640.20 and 15,424.95 is: 21,286.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,000.20 : 38,640.20 = 15,424.95 : x
  2. Step 2: Convert to fraction form
    28,000.20/38,640.20 = 15,424.95/x
  3. Step 3: Cross multiply
    28,000.20x = 38,640.20 × 15,424.95
  4. Step 4: Simplify right side
    28,000.20x = 596,023,075.87
  5. Step 5: Solve for x
    x = 596,023,075.87/28,000.20
  6. Step 6: Final answer
    x = 21,286.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.