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Finding the Fourth Proportional to 879.40, 1,317.30 and 662.32

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Solution

The fourth proportional to 879.40, 1,317.30 and 662.32 is: 992.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.40 : 1,317.30 = 662.32 : x
  2. Step 2: Convert to fraction form
    879.40/1,317.30 = 662.32/x
  3. Step 3: Cross multiply
    879.40x = 1,317.30 × 662.32
  4. Step 4: Simplify right side
    879.40x = 872,474.14
  5. Step 5: Solve for x
    x = 872,474.14/879.40
  6. Step 6: Final answer
    x = 992.12

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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.