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Finding the Fourth Proportional to 743.42, 1,026.79 and 494.30

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Solution

The fourth proportional to 743.42, 1,026.79 and 494.30 is: 682.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.42 : 1,026.79 = 494.30 : x
  2. Step 2: Convert to fraction form
    743.42/1,026.79 = 494.30/x
  3. Step 3: Cross multiply
    743.42x = 1,026.79 × 494.30
  4. Step 4: Simplify right side
    743.42x = 507,543.63
  5. Step 5: Solve for x
    x = 507,543.63/743.42
  6. Step 6: Final answer
    x = 682.71

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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.