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Finding the Fourth Proportional to 912.68, 1,258.27 and 788.08

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Solution

The fourth proportional to 912.68, 1,258.27 and 788.08 is: 1,086.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.68 : 1,258.27 = 788.08 : x
  2. Step 2: Convert to fraction form
    912.68/1,258.27 = 788.08/x
  3. Step 3: Cross multiply
    912.68x = 1,258.27 × 788.08
  4. Step 4: Simplify right side
    912.68x = 991,612.31
  5. Step 5: Solve for x
    x = 991,612.31/912.68
  6. Step 6: Final answer
    x = 1,086.48

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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.