Home / 20,688.12-31,013.28-13,294.44

Finding the Fourth Proportional to 20,688.12, 31,013.28 and 13,294.44

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Solution

The fourth proportional to 20,688.12, 31,013.28 and 13,294.44 is: 19,929.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,688.12 : 31,013.28 = 13,294.44 : x
  2. Step 2: Convert to fraction form
    20,688.12/31,013.28 = 13,294.44/x
  3. Step 3: Cross multiply
    20,688.12x = 31,013.28 × 13,294.44
  4. Step 4: Simplify right side
    20,688.12x = 412,304,190.16
  5. Step 5: Solve for x
    x = 412,304,190.16/20,688.12
  6. Step 6: Final answer
    x = 19,929.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.