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Finding the Fourth Proportional to 1,078.80, 1,617.80 and 309.04

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Solution

The fourth proportional to 1,078.80, 1,617.80 and 309.04 is: 463.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.80 : 1,617.80 = 309.04 : x
  2. Step 2: Convert to fraction form
    1,078.80/1,617.80 = 309.04/x
  3. Step 3: Cross multiply
    1,078.80x = 1,617.80 × 309.04
  4. Step 4: Simplify right side
    1,078.80x = 499,964.91
  5. Step 5: Solve for x
    x = 499,964.91/1,078.80
  6. Step 6: Final answer
    x = 463.45

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.