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Finding the Fourth Proportional to 27,999.20, 42,031.20 and 16,918.40

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Solution

The fourth proportional to 27,999.20, 42,031.20 and 16,918.40 is: 25,397.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,999.20 : 42,031.20 = 16,918.40 : x
  2. Step 2: Convert to fraction form
    27,999.20/42,031.20 = 16,918.40/x
  3. Step 3: Cross multiply
    27,999.20x = 42,031.20 × 16,918.40
  4. Step 4: Simplify right side
    27,999.20x = 711,100,654.08
  5. Step 5: Solve for x
    x = 711,100,654.08/27,999.20
  6. Step 6: Final answer
    x = 25,397.18

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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.