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Finding the Fourth Proportional to 879.65, 1,319.18 and 684.87

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Solution

The fourth proportional to 879.65, 1,319.18 and 684.87 is: 1,027.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.65 : 1,319.18 = 684.87 : x
  2. Step 2: Convert to fraction form
    879.65/1,319.18 = 684.87/x
  3. Step 3: Cross multiply
    879.65x = 1,319.18 × 684.87
  4. Step 4: Simplify right side
    879.65x = 903,463.38
  5. Step 5: Solve for x
    x = 903,463.38/879.65
  6. Step 6: Final answer
    x = 1,027.08

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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.