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Finding the Fourth Proportional to 917.91, 1,265.36 and 669.51

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Solution

The fourth proportional to 917.91, 1,265.36 and 669.51 is: 922.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.91 : 1,265.36 = 669.51 : x
  2. Step 2: Convert to fraction form
    917.91/1,265.36 = 669.51/x
  3. Step 3: Cross multiply
    917.91x = 1,265.36 × 669.51
  4. Step 4: Simplify right side
    917.91x = 847,167.83
  5. Step 5: Solve for x
    x = 847,167.83/917.91
  6. Step 6: Final answer
    x = 922.93

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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.