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Finding the Fourth Proportional to 31,689.71, 43,718.99 and 18,253.79

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Solution

The fourth proportional to 31,689.71, 43,718.99 and 18,253.79 is: 25,182.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,689.71 : 43,718.99 = 18,253.79 : x
  2. Step 2: Convert to fraction form
    31,689.71/43,718.99 = 18,253.79/x
  3. Step 3: Cross multiply
    31,689.71x = 43,718.99 × 18,253.79
  4. Step 4: Simplify right side
    31,689.71x = 798,037,262.47
  5. Step 5: Solve for x
    x = 798,037,262.47/31,689.71
  6. Step 6: Final answer
    x = 25,182.85

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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.