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Finding the Fourth Proportional to 1,078.84, 1,618.28 and 309.34

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Solution

The fourth proportional to 1,078.84, 1,618.28 and 309.34 is: 464.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.84 : 1,618.28 = 309.34 : x
  2. Step 2: Convert to fraction form
    1,078.84/1,618.28 = 309.34/x
  3. Step 3: Cross multiply
    1,078.84x = 1,618.28 × 309.34
  4. Step 4: Simplify right side
    1,078.84x = 500,598.74
  5. Step 5: Solve for x
    x = 500,598.74/1,078.84
  6. Step 6: Final answer
    x = 464.02

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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.