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Finding the Fourth Proportional to 15,503.13, 21,393.08 and 8,789.78

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Solution

The fourth proportional to 15,503.13, 21,393.08 and 8,789.78 is: 12,129.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,503.13 : 21,393.08 = 8,789.78 : x
  2. Step 2: Convert to fraction form
    15,503.13/21,393.08 = 8,789.78/x
  3. Step 3: Cross multiply
    15,503.13x = 21,393.08 × 8,789.78
  4. Step 4: Simplify right side
    15,503.13x = 188,040,509.22
  5. Step 5: Solve for x
    x = 188,040,509.22/15,503.13
  6. Step 6: Final answer
    x = 12,129.20

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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.