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Finding the Fourth Proportional to 832.78, 1,247.28 and 711.28

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Solution

The fourth proportional to 832.78, 1,247.28 and 711.28 is: 1,065.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    832.78 : 1,247.28 = 711.28 : x
  2. Step 2: Convert to fraction form
    832.78/1,247.28 = 711.28/x
  3. Step 3: Cross multiply
    832.78x = 1,247.28 × 711.28
  4. Step 4: Simplify right side
    832.78x = 887,165.32
  5. Step 5: Solve for x
    x = 887,165.32/832.78
  6. Step 6: Final answer
    x = 1,065.31

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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.