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Finding the Fourth Proportional to 15,005.70, 20,708.05 and 8,291.26

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Solution

The fourth proportional to 15,005.70, 20,708.05 and 8,291.26 is: 11,442.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,005.70 : 20,708.05 = 8,291.26 : x
  2. Step 2: Convert to fraction form
    15,005.70/20,708.05 = 8,291.26/x
  3. Step 3: Cross multiply
    15,005.70x = 20,708.05 × 8,291.26
  4. Step 4: Simplify right side
    15,005.70x = 171,695,785.19
  5. Step 5: Solve for x
    x = 171,695,785.19/15,005.70
  6. Step 6: Final answer
    x = 11,442.04

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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.