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Finding the Fourth Proportional to 15,499, 21,378.84 and 10,191.88

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Solution

The fourth proportional to 15,499, 21,378.84 and 10,191.88 is: 14,058.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,499 : 21,378.84 = 10,191.88 : x
  2. Step 2: Convert to fraction form
    15,499/21,378.84 = 10,191.88/x
  3. Step 3: Cross multiply
    15,499x = 21,378.84 × 10,191.88
  4. Step 4: Simplify right side
    15,499x = 217,890,571.82
  5. Step 5: Solve for x
    x = 217,890,571.82/15,499
  6. Step 6: Final answer
    x = 14,058.36

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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.