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Finding the Fourth Proportional to 28,987.80, 43,431.30 and 13,373.40

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Solution

The fourth proportional to 28,987.80, 43,431.30 and 13,373.40 is: 20,036.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,987.80 : 43,431.30 = 13,373.40 : x
  2. Step 2: Convert to fraction form
    28,987.80/43,431.30 = 13,373.40/x
  3. Step 3: Cross multiply
    28,987.80x = 43,431.30 × 13,373.40
  4. Step 4: Simplify right side
    28,987.80x = 580,824,147.42
  5. Step 5: Solve for x
    x = 580,824,147.42/28,987.80
  6. Step 6: Final answer
    x = 20,036.85

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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.