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Finding the Fourth Proportional to 28,401.76, 42,608.88 and 8,685.28

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Solution

The fourth proportional to 28,401.76, 42,608.88 and 8,685.28 is: 13,029.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,401.76 : 42,608.88 = 8,685.28 : x
  2. Step 2: Convert to fraction form
    28,401.76/42,608.88 = 8,685.28/x
  3. Step 3: Cross multiply
    28,401.76x = 42,608.88 × 8,685.28
  4. Step 4: Simplify right side
    28,401.76x = 370,070,053.29
  5. Step 5: Solve for x
    x = 370,070,053.29/28,401.76
  6. Step 6: Final answer
    x = 13,029.83

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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.