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Finding the Fourth Proportional to 904.70, 1,358.87 and 879.18

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Solution

The fourth proportional to 904.70, 1,358.87 and 879.18 is: 1,320.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.70 : 1,358.87 = 879.18 : x
  2. Step 2: Convert to fraction form
    904.70/1,358.87 = 879.18/x
  3. Step 3: Cross multiply
    904.70x = 1,358.87 × 879.18
  4. Step 4: Simplify right side
    904.70x = 1,194,691.33
  5. Step 5: Solve for x
    x = 1,194,691.33/904.70
  6. Step 6: Final answer
    x = 1,320.54

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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.