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Finding the Fourth Proportional to 28,442.61, 42,668.37 and 8,719.11

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Solution

The fourth proportional to 28,442.61, 42,668.37 and 8,719.11 is: 13,080.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,442.61 : 42,668.37 = 8,719.11 : x
  2. Step 2: Convert to fraction form
    28,442.61/42,668.37 = 8,719.11/x
  3. Step 3: Cross multiply
    28,442.61x = 42,668.37 × 8,719.11
  4. Step 4: Simplify right side
    28,442.61x = 372,030,211.55
  5. Step 5: Solve for x
    x = 372,030,211.55/28,442.61
  6. Step 6: Final answer
    x = 13,080.03

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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.