Home / 9,721.20-13,394.12-8,122.32

Finding the Fourth Proportional to 9,721.20, 13,394.12 and 8,122.32

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Solution

The fourth proportional to 9,721.20, 13,394.12 and 8,122.32 is: 11,191.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,721.20 : 13,394.12 = 8,122.32 : x
  2. Step 2: Convert to fraction form
    9,721.20/13,394.12 = 8,122.32/x
  3. Step 3: Cross multiply
    9,721.20x = 13,394.12 × 8,122.32
  4. Step 4: Simplify right side
    9,721.20x = 108,791,328.76
  5. Step 5: Solve for x
    x = 108,791,328.76/9,721.20
  6. Step 6: Final answer
    x = 11,191.14

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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.