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Finding the Fourth Proportional to 1,190.31, 1,643.39 and 817.17

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Solution

The fourth proportional to 1,190.31, 1,643.39 and 817.17 is: 1,128.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.31 : 1,643.39 = 817.17 : x
  2. Step 2: Convert to fraction form
    1,190.31/1,643.39 = 817.17/x
  3. Step 3: Cross multiply
    1,190.31x = 1,643.39 × 817.17
  4. Step 4: Simplify right side
    1,190.31x = 1,342,916.70
  5. Step 5: Solve for x
    x = 1,342,916.70/1,190.31
  6. Step 6: Final answer
    x = 1,128.21

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Double scale
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1.5x scale

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.