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Finding the Fourth Proportional to 832.57, 1,249.20 and 312.82

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Solution

The fourth proportional to 832.57, 1,249.20 and 312.82 is: 469.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    832.57 : 1,249.20 = 312.82 : x
  2. Step 2: Convert to fraction form
    832.57/1,249.20 = 312.82/x
  3. Step 3: Cross multiply
    832.57x = 1,249.20 × 312.82
  4. Step 4: Simplify right side
    832.57x = 390,774.74
  5. Step 5: Solve for x
    x = 390,774.74/832.57
  6. Step 6: Final answer
    x = 469.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.