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Finding the Fourth Proportional to 21,101.60, 31,652.40 and 18,250.40

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Solution

The fourth proportional to 21,101.60, 31,652.40 and 18,250.40 is: 27,375.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,101.60 : 31,652.40 = 18,250.40 : x
  2. Step 2: Convert to fraction form
    21,101.60/31,652.40 = 18,250.40/x
  3. Step 3: Cross multiply
    21,101.60x = 31,652.40 × 18,250.40
  4. Step 4: Simplify right side
    21,101.60x = 577,668,960.96
  5. Step 5: Solve for x
    x = 577,668,960.96/21,101.60
  6. Step 6: Final answer
    x = 27,375.60

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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.