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Finding the Fourth Proportional to 15,740.88, 21,722.28 and 8,936.19

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Solution

The fourth proportional to 15,740.88, 21,722.28 and 8,936.19 is: 12,331.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,740.88 : 21,722.28 = 8,936.19 : x
  2. Step 2: Convert to fraction form
    15,740.88/21,722.28 = 8,936.19/x
  3. Step 3: Cross multiply
    15,740.88x = 21,722.28 × 8,936.19
  4. Step 4: Simplify right side
    15,740.88x = 194,114,421.31
  5. Step 5: Solve for x
    x = 194,114,421.31/15,740.88
  6. Step 6: Final answer
    x = 12,331.87

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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.