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Finding the Fourth Proportional to 1,118.22, 1,543.14 and 645.99

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Solution

The fourth proportional to 1,118.22, 1,543.14 and 645.99 is: 891.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.22 : 1,543.14 = 645.99 : x
  2. Step 2: Convert to fraction form
    1,118.22/1,543.14 = 645.99/x
  3. Step 3: Cross multiply
    1,118.22x = 1,543.14 × 645.99
  4. Step 4: Simplify right side
    1,118.22x = 996,853.01
  5. Step 5: Solve for x
    x = 996,853.01/1,118.22
  6. Step 6: Final answer
    x = 891.46

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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.