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Finding the Fourth Proportional to 15,935.85, 21,989.34 and 8,860.91

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Solution

The fourth proportional to 15,935.85, 21,989.34 and 8,860.91 is: 12,226.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,935.85 : 21,989.34 = 8,860.91 : x
  2. Step 2: Convert to fraction form
    15,935.85/21,989.34 = 8,860.91/x
  3. Step 3: Cross multiply
    15,935.85x = 21,989.34 × 8,860.91
  4. Step 4: Simplify right side
    15,935.85x = 194,845,562.70
  5. Step 5: Solve for x
    x = 194,845,562.70/15,935.85
  6. Step 6: Final answer
    x = 12,226.87

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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.