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Finding the Fourth Proportional to 28,401.20, 42,601.80 and 15,959.60

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Solution

The fourth proportional to 28,401.20, 42,601.80 and 15,959.60 is: 23,939.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,401.20 : 42,601.80 = 15,959.60 : x
  2. Step 2: Convert to fraction form
    28,401.20/42,601.80 = 15,959.60/x
  3. Step 3: Cross multiply
    28,401.20x = 42,601.80 × 15,959.60
  4. Step 4: Simplify right side
    28,401.20x = 679,907,687.28
  5. Step 5: Solve for x
    x = 679,907,687.28/28,401.20
  6. Step 6: Final answer
    x = 23,939.40

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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.