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Finding the Fourth Proportional to 18,988.80, 26,191.40 and 13,020.99

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Solution

The fourth proportional to 18,988.80, 26,191.40 and 13,020.99 is: 17,959.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,988.80 : 26,191.40 = 13,020.99 : x
  2. Step 2: Convert to fraction form
    18,988.80/26,191.40 = 13,020.99/x
  3. Step 3: Cross multiply
    18,988.80x = 26,191.40 × 13,020.99
  4. Step 4: Simplify right side
    18,988.80x = 341,037,892.38
  5. Step 5: Solve for x
    x = 341,037,892.38/18,988.80
  6. Step 6: Final answer
    x = 17,959.95

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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.