Home / 15,715.67-21,687.06-8,642.04

Finding the Fourth Proportional to 15,715.67, 21,687.06 and 8,642.04

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Solution

The fourth proportional to 15,715.67, 21,687.06 and 8,642.04 is: 11,925.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,715.67 : 21,687.06 = 8,642.04 : x
  2. Step 2: Convert to fraction form
    15,715.67/21,687.06 = 8,642.04/x
  3. Step 3: Cross multiply
    15,715.67x = 21,687.06 × 8,642.04
  4. Step 4: Simplify right side
    15,715.67x = 187,420,440.00
  5. Step 5: Solve for x
    x = 187,420,440.00/15,715.67
  6. Step 6: Final answer
    x = 11,925.71

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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.