Home / 28,729.89-39,672.18-21,189.30

Finding the Fourth Proportional to 28,729.89, 39,672.18 and 21,189.30

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Solution

The fourth proportional to 28,729.89, 39,672.18 and 21,189.30 is: 29,259.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,729.89 : 39,672.18 = 21,189.30 : x
  2. Step 2: Convert to fraction form
    28,729.89/39,672.18 = 21,189.30/x
  3. Step 3: Cross multiply
    28,729.89x = 39,672.18 × 21,189.30
  4. Step 4: Simplify right side
    28,729.89x = 840,625,574.90
  5. Step 5: Solve for x
    x = 840,625,574.90/28,729.89
  6. Step 6: Final answer
    x = 29,259.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.