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Finding the Fourth Proportional to 755.78, 1,132.90 and 317.36

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Solution

The fourth proportional to 755.78, 1,132.90 and 317.36 is: 475.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.78 : 1,132.90 = 317.36 : x
  2. Step 2: Convert to fraction form
    755.78/1,132.90 = 317.36/x
  3. Step 3: Cross multiply
    755.78x = 1,132.90 × 317.36
  4. Step 4: Simplify right side
    755.78x = 359,539.18
  5. Step 5: Solve for x
    x = 359,539.18/755.78
  6. Step 6: Final answer
    x = 475.72

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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.