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Finding the Fourth Proportional to 15,720.66, 21,693.66 and 8,645.70

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Solution

The fourth proportional to 15,720.66, 21,693.66 and 8,645.70 is: 11,930.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,720.66 : 21,693.66 = 8,645.70 : x
  2. Step 2: Convert to fraction form
    15,720.66/21,693.66 = 8,645.70/x
  3. Step 3: Cross multiply
    15,720.66x = 21,693.66 × 8,645.70
  4. Step 4: Simplify right side
    15,720.66x = 187,556,876.26
  5. Step 5: Solve for x
    x = 187,556,876.26/15,720.66
  6. Step 6: Final answer
    x = 11,930.60

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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.