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Finding the Fourth Proportional to 912.57, 1,368.18 and 639.15

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Solution

The fourth proportional to 912.57, 1,368.18 and 639.15 is: 958.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.57 : 1,368.18 = 639.15 : x
  2. Step 2: Convert to fraction form
    912.57/1,368.18 = 639.15/x
  3. Step 3: Cross multiply
    912.57x = 1,368.18 × 639.15
  4. Step 4: Simplify right side
    912.57x = 874,472.25
  5. Step 5: Solve for x
    x = 874,472.25/912.57
  6. Step 6: Final answer
    x = 958.25

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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.