Home / 28,456.78-42,685.18-7,680.28

Finding the Fourth Proportional to 28,456.78, 42,685.18 and 7,680.28

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Solution

The fourth proportional to 28,456.78, 42,685.18 and 7,680.28 is: 11,520.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,456.78 : 42,685.18 = 7,680.28 : x
  2. Step 2: Convert to fraction form
    28,456.78/42,685.18 = 7,680.28/x
  3. Step 3: Cross multiply
    28,456.78x = 42,685.18 × 7,680.28
  4. Step 4: Simplify right side
    28,456.78x = 327,834,134.25
  5. Step 5: Solve for x
    x = 327,834,134.25/28,456.78
  6. Step 6: Final answer
    x = 11,520.42

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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.