Home / 15,715.70-21,688.24-8,642.78

Finding the Fourth Proportional to 15,715.70, 21,688.24 and 8,642.78

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Solution

The fourth proportional to 15,715.70, 21,688.24 and 8,642.78 is: 11,927.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,715.70 : 21,688.24 = 8,642.78 : x
  2. Step 2: Convert to fraction form
    15,715.70/21,688.24 = 8,642.78/x
  3. Step 3: Cross multiply
    15,715.70x = 21,688.24 × 8,642.78
  4. Step 4: Simplify right side
    15,715.70x = 187,446,556.86
  5. Step 5: Solve for x
    x = 187,446,556.86/15,715.70
  6. Step 6: Final answer
    x = 11,927.35

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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.