Home / 21,427.20-32,140.80-6,640.65

Finding the Fourth Proportional to 21,427.20, 32,140.80 and 6,640.65

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Solution

The fourth proportional to 21,427.20, 32,140.80 and 6,640.65 is: 9,960.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,427.20 : 32,140.80 = 6,640.65 : x
  2. Step 2: Convert to fraction form
    21,427.20/32,140.80 = 6,640.65/x
  3. Step 3: Cross multiply
    21,427.20x = 32,140.80 × 6,640.65
  4. Step 4: Simplify right side
    21,427.20x = 213,435,803.52
  5. Step 5: Solve for x
    x = 213,435,803.52/21,427.20
  6. Step 6: Final answer
    x = 9,960.98

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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.