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Finding the Fourth Proportional to 15,111.65, 20,853.12 and 8,396.87

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Solution

The fourth proportional to 15,111.65, 20,853.12 and 8,396.87 is: 11,587.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,111.65 : 20,853.12 = 8,396.87 : x
  2. Step 2: Convert to fraction form
    15,111.65/20,853.12 = 8,396.87/x
  3. Step 3: Cross multiply
    15,111.65x = 20,853.12 × 8,396.87
  4. Step 4: Simplify right side
    15,111.65x = 175,101,012.71
  5. Step 5: Solve for x
    x = 175,101,012.71/15,111.65
  6. Step 6: Final answer
    x = 11,587.16

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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.