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Finding the Fourth Proportional to 13,710.88, 18,921.42 and 8,331.52

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Solution

The fourth proportional to 13,710.88, 18,921.42 and 8,331.52 is: 11,497.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,710.88 : 18,921.42 = 8,331.52 : x
  2. Step 2: Convert to fraction form
    13,710.88/18,921.42 = 8,331.52/x
  3. Step 3: Cross multiply
    13,710.88x = 18,921.42 × 8,331.52
  4. Step 4: Simplify right side
    13,710.88x = 157,644,189.16
  5. Step 5: Solve for x
    x = 157,644,189.16/13,710.88
  6. Step 6: Final answer
    x = 11,497.74

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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.