Home / 31,387.20-47,080.80-18,254.40

Finding the Fourth Proportional to 31,387.20, 47,080.80 and 18,254.40

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Solution

The fourth proportional to 31,387.20, 47,080.80 and 18,254.40 is: 27,381.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,387.20 : 47,080.80 = 18,254.40 : x
  2. Step 2: Convert to fraction form
    31,387.20/47,080.80 = 18,254.40/x
  3. Step 3: Cross multiply
    31,387.20x = 47,080.80 × 18,254.40
  4. Step 4: Simplify right side
    31,387.20x = 859,431,755.52
  5. Step 5: Solve for x
    x = 859,431,755.52/31,387.20
  6. Step 6: Final answer
    x = 27,381.60

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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.