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Finding the Fourth Proportional to 28,670.80, 42,905.40 and 25,013.20

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Solution

The fourth proportional to 28,670.80, 42,905.40 and 25,013.20 is: 37,431.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,670.80 : 42,905.40 = 25,013.20 : x
  2. Step 2: Convert to fraction form
    28,670.80/42,905.40 = 25,013.20/x
  3. Step 3: Cross multiply
    28,670.80x = 42,905.40 × 25,013.20
  4. Step 4: Simplify right side
    28,670.80x = 1,073,201,351.28
  5. Step 5: Solve for x
    x = 1,073,201,351.28/28,670.80
  6. Step 6: Final answer
    x = 37,431.86

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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.