Home / 21,287.88-31,948.83-12,530.16

Finding the Fourth Proportional to 21,287.88, 31,948.83 and 12,530.16

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Solution

The fourth proportional to 21,287.88, 31,948.83 and 12,530.16 is: 18,805.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,287.88 : 31,948.83 = 12,530.16 : x
  2. Step 2: Convert to fraction form
    21,287.88/31,948.83 = 12,530.16/x
  3. Step 3: Cross multiply
    21,287.88x = 31,948.83 × 12,530.16
  4. Step 4: Simplify right side
    21,287.88x = 400,323,951.71
  5. Step 5: Solve for x
    x = 400,323,951.71/21,287.88
  6. Step 6: Final answer
    x = 18,805.25

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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.