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Finding the Fourth Proportional to 918.74, 1,269.59 and 697.29

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Solution

The fourth proportional to 918.74, 1,269.59 and 697.29 is: 963.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.74 : 1,269.59 = 697.29 : x
  2. Step 2: Convert to fraction form
    918.74/1,269.59 = 697.29/x
  3. Step 3: Cross multiply
    918.74x = 1,269.59 × 697.29
  4. Step 4: Simplify right side
    918.74x = 885,268.92
  5. Step 5: Solve for x
    x = 885,268.92/918.74
  6. Step 6: Final answer
    x = 963.57

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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.