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Finding the Fourth Proportional to 984.52, 1,357.86 and 918.28

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Solution

The fourth proportional to 984.52, 1,357.86 and 918.28 is: 1,266.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.52 : 1,357.86 = 918.28 : x
  2. Step 2: Convert to fraction form
    984.52/1,357.86 = 918.28/x
  3. Step 3: Cross multiply
    984.52x = 1,357.86 × 918.28
  4. Step 4: Simplify right side
    984.52x = 1,246,895.68
  5. Step 5: Solve for x
    x = 1,246,895.68/984.52
  6. Step 6: Final answer
    x = 1,266.50

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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.