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Finding the Fourth Proportional to 743.22, 1,026.60 and 678.82

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Solution

The fourth proportional to 743.22, 1,026.60 and 678.82 is: 937.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.22 : 1,026.60 = 678.82 : x
  2. Step 2: Convert to fraction form
    743.22/1,026.60 = 678.82/x
  3. Step 3: Cross multiply
    743.22x = 1,026.60 × 678.82
  4. Step 4: Simplify right side
    743.22x = 696,876.61
  5. Step 5: Solve for x
    x = 696,876.61/743.22
  6. Step 6: Final answer
    x = 937.65

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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.