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Finding the Fourth Proportional to 912.92, 1,258.56 and 688.75

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Solution

The fourth proportional to 912.92, 1,258.56 and 688.75 is: 949.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.92 : 1,258.56 = 688.75 : x
  2. Step 2: Convert to fraction form
    912.92/1,258.56 = 688.75/x
  3. Step 3: Cross multiply
    912.92x = 1,258.56 × 688.75
  4. Step 4: Simplify right side
    912.92x = 866,830.05
  5. Step 5: Solve for x
    x = 866,830.05/912.92
  6. Step 6: Final answer
    x = 949.52

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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.