Home / 30,691.90-42,354.12-18,755.20

Finding the Fourth Proportional to 30,691.90, 42,354.12 and 18,755.20

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Solution

The fourth proportional to 30,691.90, 42,354.12 and 18,755.20 is: 25,881.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,691.90 : 42,354.12 = 18,755.20 : x
  2. Step 2: Convert to fraction form
    30,691.90/42,354.12 = 18,755.20/x
  3. Step 3: Cross multiply
    30,691.90x = 42,354.12 × 18,755.20
  4. Step 4: Simplify right side
    30,691.90x = 794,359,991.42
  5. Step 5: Solve for x
    x = 794,359,991.42/30,691.90
  6. Step 6: Final answer
    x = 25,881.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.