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Finding the Fourth Proportional to 1,048.58, 1,578.10 and 789.92

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Solution

The fourth proportional to 1,048.58, 1,578.10 and 789.92 is: 1,188.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,048.58 : 1,578.10 = 789.92 : x
  2. Step 2: Convert to fraction form
    1,048.58/1,578.10 = 789.92/x
  3. Step 3: Cross multiply
    1,048.58x = 1,578.10 × 789.92
  4. Step 4: Simplify right side
    1,048.58x = 1,246,572.75
  5. Step 5: Solve for x
    x = 1,246,572.75/1,048.58
  6. Step 6: Final answer
    x = 1,188.82

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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.