Home / 28,375.81-39,158.15-15,630.21

Finding the Fourth Proportional to 28,375.81, 39,158.15 and 15,630.21

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Solution

The fourth proportional to 28,375.81, 39,158.15 and 15,630.21 is: 21,569.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,375.81 : 39,158.15 = 15,630.21 : x
  2. Step 2: Convert to fraction form
    28,375.81/39,158.15 = 15,630.21/x
  3. Step 3: Cross multiply
    28,375.81x = 39,158.15 × 15,630.21
  4. Step 4: Simplify right side
    28,375.81x = 612,050,146.79
  5. Step 5: Solve for x
    x = 612,050,146.79/28,375.81
  6. Step 6: Final answer
    x = 21,569.44

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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.