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Finding the Fourth Proportional to 1,078.93, 1,618.06 and 688.38

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Solution

The fourth proportional to 1,078.93, 1,618.06 and 688.38 is: 1,032.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.93 : 1,618.06 = 688.38 : x
  2. Step 2: Convert to fraction form
    1,078.93/1,618.06 = 688.38/x
  3. Step 3: Cross multiply
    1,078.93x = 1,618.06 × 688.38
  4. Step 4: Simplify right side
    1,078.93x = 1,113,840.14
  5. Step 5: Solve for x
    x = 1,113,840.14/1,078.93
  6. Step 6: Final answer
    x = 1,032.36

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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.