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Finding the Fourth Proportional to 15,691.10, 21,657.69 and 8,978.81

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Solution

The fourth proportional to 15,691.10, 21,657.69 and 8,978.81 is: 12,393.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,691.10 : 21,657.69 = 8,978.81 : x
  2. Step 2: Convert to fraction form
    15,691.10/21,657.69 = 8,978.81/x
  3. Step 3: Cross multiply
    15,691.10x = 21,657.69 × 8,978.81
  4. Step 4: Simplify right side
    15,691.10x = 194,460,175.26
  5. Step 5: Solve for x
    x = 194,460,175.26/15,691.10
  6. Step 6: Final answer
    x = 12,393.03

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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.