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Finding the Fourth Proportional to 15,159.10, 20,918.28 and 8,443.66

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Solution

The fourth proportional to 15,159.10, 20,918.28 and 8,443.66 is: 11,651.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,159.10 : 20,918.28 = 8,443.66 : x
  2. Step 2: Convert to fraction form
    15,159.10/20,918.28 = 8,443.66/x
  3. Step 3: Cross multiply
    15,159.10x = 20,918.28 × 8,443.66
  4. Step 4: Simplify right side
    15,159.10x = 176,626,844.10
  5. Step 5: Solve for x
    x = 176,626,844.10/15,159.10
  6. Step 6: Final answer
    x = 11,651.54

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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.