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Finding the Fourth Proportional to 15,155.97, 20,909.34 and 9,488.40

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Solution

The fourth proportional to 15,155.97, 20,909.34 and 9,488.40 is: 13,090.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,155.97 : 20,909.34 = 9,488.40 : x
  2. Step 2: Convert to fraction form
    15,155.97/20,909.34 = 9,488.40/x
  3. Step 3: Cross multiply
    15,155.97x = 20,909.34 × 9,488.40
  4. Step 4: Simplify right side
    15,155.97x = 198,396,181.66
  5. Step 5: Solve for x
    x = 198,396,181.66/15,155.97
  6. Step 6: Final answer
    x = 13,090.30

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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.