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Finding the Fourth Proportional to 1,078.77, 1,618.13 and 615.40

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Solution

The fourth proportional to 1,078.77, 1,618.13 and 615.40 is: 923.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.77 : 1,618.13 = 615.40 : x
  2. Step 2: Convert to fraction form
    1,078.77/1,618.13 = 615.40/x
  3. Step 3: Cross multiply
    1,078.77x = 1,618.13 × 615.40
  4. Step 4: Simplify right side
    1,078.77x = 995,791.23
  5. Step 5: Solve for x
    x = 995,791.23/1,078.77
  6. Step 6: Final answer
    x = 923.08

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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.