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Finding the Fourth Proportional to 15,005.90, 20,708.06 and 8,291.99

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Solution

The fourth proportional to 15,005.90, 20,708.06 and 8,291.99 is: 11,442.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,005.90 : 20,708.06 = 8,291.99 : x
  2. Step 2: Convert to fraction form
    15,005.90/20,708.06 = 8,291.99/x
  3. Step 3: Cross multiply
    15,005.90x = 20,708.06 × 8,291.99
  4. Step 4: Simplify right side
    15,005.90x = 171,711,036.75
  5. Step 5: Solve for x
    x = 171,711,036.75/15,005.90
  6. Step 6: Final answer
    x = 11,442.90

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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.