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Finding the Fourth Proportional to 1,118.13, 1,543 and 646.09

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Solution

The fourth proportional to 1,118.13, 1,543 and 646.09 is: 891.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.13 : 1,543 = 646.09 : x
  2. Step 2: Convert to fraction form
    1,118.13/1,543 = 646.09/x
  3. Step 3: Cross multiply
    1,118.13x = 1,543 × 646.09
  4. Step 4: Simplify right side
    1,118.13x = 996,916.87
  5. Step 5: Solve for x
    x = 996,916.87/1,118.13
  6. Step 6: Final answer
    x = 891.59

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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.