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Finding the Fourth Proportional to 879.68, 1,316.78 and 659

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Solution

The fourth proportional to 879.68, 1,316.78 and 659 is: 986.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.68 : 1,316.78 = 659 : x
  2. Step 2: Convert to fraction form
    879.68/1,316.78 = 659/x
  3. Step 3: Cross multiply
    879.68x = 1,316.78 × 659
  4. Step 4: Simplify right side
    879.68x = 867,758.02
  5. Step 5: Solve for x
    x = 867,758.02/879.68
  6. Step 6: Final answer
    x = 986.45

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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.