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Finding the Fourth Proportional to 15,087.90, 20,818.08 and 9,118.38

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Solution

The fourth proportional to 15,087.90, 20,818.08 and 9,118.38 is: 12,581.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,087.90 : 20,818.08 = 9,118.38 : x
  2. Step 2: Convert to fraction form
    15,087.90/20,818.08 = 9,118.38/x
  3. Step 3: Cross multiply
    15,087.90x = 20,818.08 × 9,118.38
  4. Step 4: Simplify right side
    15,087.90x = 189,827,164.31
  5. Step 5: Solve for x
    x = 189,827,164.31/15,087.90
  6. Step 6: Final answer
    x = 12,581.42

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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.