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Finding the Fourth Proportional to 1,098.90, 1,640.63 and 1,007.70

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Solution

The fourth proportional to 1,098.90, 1,640.63 and 1,007.70 is: 1,504.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.90 : 1,640.63 = 1,007.70 : x
  2. Step 2: Convert to fraction form
    1,098.90/1,640.63 = 1,007.70/x
  3. Step 3: Cross multiply
    1,098.90x = 1,640.63 × 1,007.70
  4. Step 4: Simplify right side
    1,098.90x = 1,653,257.81
  5. Step 5: Solve for x
    x = 1,653,257.81/1,098.90
  6. Step 6: Final answer
    x = 1,504.47

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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.