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Finding the Fourth Proportional to 15,865.26, 21,879.72 and 9,897.54

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Solution

The fourth proportional to 15,865.26, 21,879.72 and 9,897.54 is: 13,649.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,865.26 : 21,879.72 = 9,897.54 : x
  2. Step 2: Convert to fraction form
    15,865.26/21,879.72 = 9,897.54/x
  3. Step 3: Cross multiply
    15,865.26x = 21,879.72 × 9,897.54
  4. Step 4: Simplify right side
    15,865.26x = 216,555,403.89
  5. Step 5: Solve for x
    x = 216,555,403.89/15,865.26
  6. Step 6: Final answer
    x = 13,649.66

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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.