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Finding the Fourth Proportional to 38,548.80, 57,839.40 and 21,031.20

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Solution

The fourth proportional to 38,548.80, 57,839.40 and 21,031.20 is: 31,555.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,548.80 : 57,839.40 = 21,031.20 : x
  2. Step 2: Convert to fraction form
    38,548.80/57,839.40 = 21,031.20/x
  3. Step 3: Cross multiply
    38,548.80x = 57,839.40 × 21,031.20
  4. Step 4: Simplify right side
    38,548.80x = 1,216,431,989.28
  5. Step 5: Solve for x
    x = 1,216,431,989.28/38,548.80
  6. Step 6: Final answer
    x = 31,555.64

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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.