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Finding the Fourth Proportional to 10,968.35, 15,129.35 and 7,191.76

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Solution

The fourth proportional to 10,968.35, 15,129.35 and 7,191.76 is: 9,920.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,968.35 : 15,129.35 = 7,191.76 : x
  2. Step 2: Convert to fraction form
    10,968.35/15,129.35 = 7,191.76/x
  3. Step 3: Cross multiply
    10,968.35x = 15,129.35 × 7,191.76
  4. Step 4: Simplify right side
    10,968.35x = 108,806,709.96
  5. Step 5: Solve for x
    x = 108,806,709.96/10,968.35
  6. Step 6: Final answer
    x = 9,920.06

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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.