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Finding the Fourth Proportional to 917.57, 1,265.95 and 622.73

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Solution

The fourth proportional to 917.57, 1,265.95 and 622.73 is: 859.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.57 : 1,265.95 = 622.73 : x
  2. Step 2: Convert to fraction form
    917.57/1,265.95 = 622.73/x
  3. Step 3: Cross multiply
    917.57x = 1,265.95 × 622.73
  4. Step 4: Simplify right side
    917.57x = 788,345.04
  5. Step 5: Solve for x
    x = 788,345.04/917.57
  6. Step 6: Final answer
    x = 859.17

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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.