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Finding the Fourth Proportional to 826.86, 1,239.48 and 480.06

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Solution

The fourth proportional to 826.86, 1,239.48 and 480.06 is: 719.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.86 : 1,239.48 = 480.06 : x
  2. Step 2: Convert to fraction form
    826.86/1,239.48 = 480.06/x
  3. Step 3: Cross multiply
    826.86x = 1,239.48 × 480.06
  4. Step 4: Simplify right side
    826.86x = 595,024.77
  5. Step 5: Solve for x
    x = 595,024.77/826.86
  6. Step 6: Final answer
    x = 719.62

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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.