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Finding the Fourth Proportional to 28,978.67, 43,474.22 and 8,987.72

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Solution

The fourth proportional to 28,978.67, 43,474.22 and 8,987.72 is: 13,483.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,978.67 : 43,474.22 = 8,987.72 : x
  2. Step 2: Convert to fraction form
    28,978.67/43,474.22 = 8,987.72/x
  3. Step 3: Cross multiply
    28,978.67x = 43,474.22 × 8,987.72
  4. Step 4: Simplify right side
    28,978.67x = 390,733,854.27
  5. Step 5: Solve for x
    x = 390,733,854.27/28,978.67
  6. Step 6: Final answer
    x = 13,483.50

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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.