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Finding the Fourth Proportional to 1,098.90, 1,640.41 and 934.83

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Solution

The fourth proportional to 1,098.90, 1,640.41 and 934.83 is: 1,395.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.90 : 1,640.41 = 934.83 : x
  2. Step 2: Convert to fraction form
    1,098.90/1,640.41 = 934.83/x
  3. Step 3: Cross multiply
    1,098.90x = 1,640.41 × 934.83
  4. Step 4: Simplify right side
    1,098.90x = 1,533,502.14
  5. Step 5: Solve for x
    x = 1,533,502.14/1,098.90
  6. Step 6: Final answer
    x = 1,395.49

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.