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Finding the Fourth Proportional to 779.92, 1,168.87 and 317.16

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Solution

The fourth proportional to 779.92, 1,168.87 and 317.16 is: 475.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.92 : 1,168.87 = 317.16 : x
  2. Step 2: Convert to fraction form
    779.92/1,168.87 = 317.16/x
  3. Step 3: Cross multiply
    779.92x = 1,168.87 × 317.16
  4. Step 4: Simplify right side
    779.92x = 370,718.81
  5. Step 5: Solve for x
    x = 370,718.81/779.92
  6. Step 6: Final answer
    x = 475.33

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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.