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Finding the Fourth Proportional to 3,119.20, 4,678.56 and 928

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Solution

The fourth proportional to 3,119.20, 4,678.56 and 928 is: 1,391.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,119.20 : 4,678.56 = 928 : x
  2. Step 2: Convert to fraction form
    3,119.20/4,678.56 = 928/x
  3. Step 3: Cross multiply
    3,119.20x = 4,678.56 × 928
  4. Step 4: Simplify right side
    3,119.20x = 4,341,703.68
  5. Step 5: Solve for x
    x = 4,341,703.68/3,119.20
  6. Step 6: Final answer
    x = 1,391.93

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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.