Home / 15,715.64-21,688.28-8,642.31

Finding the Fourth Proportional to 15,715.64, 21,688.28 and 8,642.31

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Solution

The fourth proportional to 15,715.64, 21,688.28 and 8,642.31 is: 11,926.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,715.64 : 21,688.28 = 8,642.31 : x
  2. Step 2: Convert to fraction form
    15,715.64/21,688.28 = 8,642.31/x
  3. Step 3: Cross multiply
    15,715.64x = 21,688.28 × 8,642.31
  4. Step 4: Simplify right side
    15,715.64x = 187,436,795.92
  5. Step 5: Solve for x
    x = 187,436,795.92/15,715.64
  6. Step 6: Final answer
    x = 11,926.77

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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.