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Finding the Fourth Proportional to 15,886.85, 21,879.46 and 15,542.47

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Solution

The fourth proportional to 15,886.85, 21,879.46 and 15,542.47 is: 21,405.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,886.85 : 21,879.46 = 15,542.47 : x
  2. Step 2: Convert to fraction form
    15,886.85/21,879.46 = 15,542.47/x
  3. Step 3: Cross multiply
    15,886.85x = 21,879.46 × 15,542.47
  4. Step 4: Simplify right side
    15,886.85x = 340,060,850.67
  5. Step 5: Solve for x
    x = 340,060,850.67/15,886.85
  6. Step 6: Final answer
    x = 21,405.18

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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.