Home / 21,306.90-31,796.15-18,715.30

Finding the Fourth Proportional to 21,306.90, 31,796.15 and 18,715.30

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Solution

The fourth proportional to 21,306.90, 31,796.15 and 18,715.30 is: 27,928.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,306.90 : 31,796.15 = 18,715.30 : x
  2. Step 2: Convert to fraction form
    21,306.90/31,796.15 = 18,715.30/x
  3. Step 3: Cross multiply
    21,306.90x = 31,796.15 × 18,715.30
  4. Step 4: Simplify right side
    21,306.90x = 595,074,491.88
  5. Step 5: Solve for x
    x = 595,074,491.88/21,306.90
  6. Step 6: Final answer
    x = 27,928.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.