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Finding the Fourth Proportional to 1,228.95, 1,695.81 and 731.49

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Solution

The fourth proportional to 1,228.95, 1,695.81 and 731.49 is: 1,009.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.95 : 1,695.81 = 731.49 : x
  2. Step 2: Convert to fraction form
    1,228.95/1,695.81 = 731.49/x
  3. Step 3: Cross multiply
    1,228.95x = 1,695.81 × 731.49
  4. Step 4: Simplify right side
    1,228.95x = 1,240,468.06
  5. Step 5: Solve for x
    x = 1,240,468.06/1,228.95
  6. Step 6: Final answer
    x = 1,009.37

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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.