Home / 21,307.20-31,989.60-13,531.20

Finding the Fourth Proportional to 21,307.20, 31,989.60 and 13,531.20

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Solution

The fourth proportional to 21,307.20, 31,989.60 and 13,531.20 is: 20,315.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,307.20 : 31,989.60 = 13,531.20 : x
  2. Step 2: Convert to fraction form
    21,307.20/31,989.60 = 13,531.20/x
  3. Step 3: Cross multiply
    21,307.20x = 31,989.60 × 13,531.20
  4. Step 4: Simplify right side
    21,307.20x = 432,857,675.52
  5. Step 5: Solve for x
    x = 432,857,675.52/21,307.20
  6. Step 6: Final answer
    x = 20,315.09

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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.