Home / 15,715.13-21,686.94-8,642.07

Finding the Fourth Proportional to 15,715.13, 21,686.94 and 8,642.07

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Solution

The fourth proportional to 15,715.13, 21,686.94 and 8,642.07 is: 11,926.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,715.13 : 21,686.94 = 8,642.07 : x
  2. Step 2: Convert to fraction form
    15,715.13/21,686.94 = 8,642.07/x
  3. Step 3: Cross multiply
    15,715.13x = 21,686.94 × 8,642.07
  4. Step 4: Simplify right side
    15,715.13x = 187,420,053.57
  5. Step 5: Solve for x
    x = 187,420,053.57/15,715.13
  6. Step 6: Final answer
    x = 11,926.09

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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.