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Finding the Fourth Proportional to 1,098.94, 1,648.52 and 405.79

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Solution

The fourth proportional to 1,098.94, 1,648.52 and 405.79 is: 608.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.94 : 1,648.52 = 405.79 : x
  2. Step 2: Convert to fraction form
    1,098.94/1,648.52 = 405.79/x
  3. Step 3: Cross multiply
    1,098.94x = 1,648.52 × 405.79
  4. Step 4: Simplify right side
    1,098.94x = 668,952.93
  5. Step 5: Solve for x
    x = 668,952.93/1,098.94
  6. Step 6: Final answer
    x = 608.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.