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Finding the Fourth Proportional to 779.55, 1,168.70 and 317.55

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Solution

The fourth proportional to 779.55, 1,168.70 and 317.55 is: 476.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.55 : 1,168.70 = 317.55 : x
  2. Step 2: Convert to fraction form
    779.55/1,168.70 = 317.55/x
  3. Step 3: Cross multiply
    779.55x = 1,168.70 × 317.55
  4. Step 4: Simplify right side
    779.55x = 371,119.10
  5. Step 5: Solve for x
    x = 371,119.10/779.55
  6. Step 6: Final answer
    x = 476.07

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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.