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Finding the Fourth Proportional to 912.19, 1,258.84 and 498.19

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Solution

The fourth proportional to 912.19, 1,258.84 and 498.19 is: 687.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.19 : 1,258.84 = 498.19 : x
  2. Step 2: Convert to fraction form
    912.19/1,258.84 = 498.19/x
  3. Step 3: Cross multiply
    912.19x = 1,258.84 × 498.19
  4. Step 4: Simplify right side
    912.19x = 627,138.98
  5. Step 5: Solve for x
    x = 627,138.98/912.19
  6. Step 6: Final answer
    x = 687.51

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1.5x scale

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.