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Finding the Fourth Proportional to 688.39, 944.36 and 667.58

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Solution

The fourth proportional to 688.39, 944.36 and 667.58 is: 915.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.39 : 944.36 = 667.58 : x
  2. Step 2: Convert to fraction form
    688.39/944.36 = 667.58/x
  3. Step 3: Cross multiply
    688.39x = 944.36 × 667.58
  4. Step 4: Simplify right side
    688.39x = 630,435.85
  5. Step 5: Solve for x
    x = 630,435.85/688.39
  6. Step 6: Final answer
    x = 915.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.