Home / 21,156.48-31,729.50-8,680.05

Finding the Fourth Proportional to 21,156.48, 31,729.50 and 8,680.05

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Solution

The fourth proportional to 21,156.48, 31,729.50 and 8,680.05 is: 13,017.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,156.48 : 31,729.50 = 8,680.05 : x
  2. Step 2: Convert to fraction form
    21,156.48/31,729.50 = 8,680.05/x
  3. Step 3: Cross multiply
    21,156.48x = 31,729.50 × 8,680.05
  4. Step 4: Simplify right side
    21,156.48x = 275,413,646.48
  5. Step 5: Solve for x
    x = 275,413,646.48/21,156.48
  6. Step 6: Final answer
    x = 13,017.93

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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.