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Finding the Fourth Proportional to 28,465.80, 42,693.90 and 8,739

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Solution

The fourth proportional to 28,465.80, 42,693.90 and 8,739 is: 13,107.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,465.80 : 42,693.90 = 8,739 : x
  2. Step 2: Convert to fraction form
    28,465.80/42,693.90 = 8,739/x
  3. Step 3: Cross multiply
    28,465.80x = 42,693.90 × 8,739
  4. Step 4: Simplify right side
    28,465.80x = 373,101,992.10
  5. Step 5: Solve for x
    x = 373,101,992.10/28,465.80
  6. Step 6: Final answer
    x = 13,107.03

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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.