Home / 21,326.20-31,989.30-16,871.80

Finding the Fourth Proportional to 21,326.20, 31,989.30 and 16,871.80

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Solution

The fourth proportional to 21,326.20, 31,989.30 and 16,871.80 is: 25,307.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,326.20 : 31,989.30 = 16,871.80 : x
  2. Step 2: Convert to fraction form
    21,326.20/31,989.30 = 16,871.80/x
  3. Step 3: Cross multiply
    21,326.20x = 31,989.30 × 16,871.80
  4. Step 4: Simplify right side
    21,326.20x = 539,717,071.74
  5. Step 5: Solve for x
    x = 539,717,071.74/21,326.20
  6. Step 6: Final answer
    x = 25,307.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.