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Finding the Fourth Proportional to 917, 1,265.38 and 622.12

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Solution

The fourth proportional to 917, 1,265.38 and 622.12 is: 858.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    917 : 1,265.38 = 622.12 : x
  2. Step 2: Convert to fraction form
    917/1,265.38 = 622.12/x
  3. Step 3: Cross multiply
    917x = 1,265.38 × 622.12
  4. Step 4: Simplify right side
    917x = 787,218.21
  5. Step 5: Solve for x
    x = 787,218.21/917
  6. Step 6: Final answer
    x = 858.47

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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.