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Finding the Fourth Proportional to 15,111.85, 20,853.87 and 8,397.31

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Solution

The fourth proportional to 15,111.85, 20,853.87 and 8,397.31 is: 11,588.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,111.85 : 20,853.87 = 8,397.31 : x
  2. Step 2: Convert to fraction form
    15,111.85/20,853.87 = 8,397.31/x
  3. Step 3: Cross multiply
    15,111.85x = 20,853.87 × 8,397.31
  4. Step 4: Simplify right side
    15,111.85x = 175,116,411.09
  5. Step 5: Solve for x
    x = 175,116,411.09/15,111.85
  6. Step 6: Final answer
    x = 11,588.02

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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.