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Finding the Fourth Proportional to 912.55, 1,368.83 and 426.15

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Solution

The fourth proportional to 912.55, 1,368.83 and 426.15 is: 639.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.55 : 1,368.83 = 426.15 : x
  2. Step 2: Convert to fraction form
    912.55/1,368.83 = 426.15/x
  3. Step 3: Cross multiply
    912.55x = 1,368.83 × 426.15
  4. Step 4: Simplify right side
    912.55x = 583,326.90
  5. Step 5: Solve for x
    x = 583,326.90/912.55
  6. Step 6: Final answer
    x = 639.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.