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Finding the Fourth Proportional to 918.66, 1,269.44 and 669.56

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Solution

The fourth proportional to 918.66, 1,269.44 and 669.56 is: 925.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.66 : 1,269.44 = 669.56 : x
  2. Step 2: Convert to fraction form
    918.66/1,269.44 = 669.56/x
  3. Step 3: Cross multiply
    918.66x = 1,269.44 × 669.56
  4. Step 4: Simplify right side
    918.66x = 849,959.06
  5. Step 5: Solve for x
    x = 849,959.06/918.66
  6. Step 6: Final answer
    x = 925.21

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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.