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Finding the Fourth Proportional to 668.89, 1,007.06 and 611.53

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Solution

The fourth proportional to 668.89, 1,007.06 and 611.53 is: 920.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.89 : 1,007.06 = 611.53 : x
  2. Step 2: Convert to fraction form
    668.89/1,007.06 = 611.53/x
  3. Step 3: Cross multiply
    668.89x = 1,007.06 × 611.53
  4. Step 4: Simplify right side
    668.89x = 615,847.40
  5. Step 5: Solve for x
    x = 615,847.40/668.89
  6. Step 6: Final answer
    x = 920.70

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.