Home / 21,255.60-31,807.80-18,512.40

Finding the Fourth Proportional to 21,255.60, 31,807.80 and 18,512.40

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Solution

The fourth proportional to 21,255.60, 31,807.80 and 18,512.40 is: 27,702.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,255.60 : 31,807.80 = 18,512.40 : x
  2. Step 2: Convert to fraction form
    21,255.60/31,807.80 = 18,512.40/x
  3. Step 3: Cross multiply
    21,255.60x = 31,807.80 × 18,512.40
  4. Step 4: Simplify right side
    21,255.60x = 588,838,716.72
  5. Step 5: Solve for x
    x = 588,838,716.72/21,255.60
  6. Step 6: Final answer
    x = 27,702.76

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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.