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Finding the Fourth Proportional to 1,008.62, 1,391.88 and 654.68

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Solution

The fourth proportional to 1,008.62, 1,391.88 and 654.68 is: 903.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.62 : 1,391.88 = 654.68 : x
  2. Step 2: Convert to fraction form
    1,008.62/1,391.88 = 654.68/x
  3. Step 3: Cross multiply
    1,008.62x = 1,391.88 × 654.68
  4. Step 4: Simplify right side
    1,008.62x = 911,236.00
  5. Step 5: Solve for x
    x = 911,236.00/1,008.62
  6. Step 6: Final answer
    x = 903.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.