Home / 15,715.84-21,688.32-8,642.72

Finding the Fourth Proportional to 15,715.84, 21,688.32 and 8,642.72

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Solution

The fourth proportional to 15,715.84, 21,688.32 and 8,642.72 is: 11,927.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,715.84 : 21,688.32 = 8,642.72 : x
  2. Step 2: Convert to fraction form
    15,715.84/21,688.32 = 8,642.72/x
  3. Step 3: Cross multiply
    15,715.84x = 21,688.32 × 8,642.72
  4. Step 4: Simplify right side
    15,715.84x = 187,446,077.03
  5. Step 5: Solve for x
    x = 187,446,077.03/15,715.84
  6. Step 6: Final answer
    x = 11,927.21

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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.