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Finding the Fourth Proportional to 1,088.62, 1,634.90 and 678.55

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Solution

The fourth proportional to 1,088.62, 1,634.90 and 678.55 is: 1,019.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,088.62 : 1,634.90 = 678.55 : x
  2. Step 2: Convert to fraction form
    1,088.62/1,634.90 = 678.55/x
  3. Step 3: Cross multiply
    1,088.62x = 1,634.90 × 678.55
  4. Step 4: Simplify right side
    1,088.62x = 1,109,361.40
  5. Step 5: Solve for x
    x = 1,109,361.40/1,088.62
  6. Step 6: Final answer
    x = 1,019.05

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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.