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Finding the Fourth Proportional to 826.77, 1,240.78 and 436.72

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Solution

The fourth proportional to 826.77, 1,240.78 and 436.72 is: 655.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.77 : 1,240.78 = 436.72 : x
  2. Step 2: Convert to fraction form
    826.77/1,240.78 = 436.72/x
  3. Step 3: Cross multiply
    826.77x = 1,240.78 × 436.72
  4. Step 4: Simplify right side
    826.77x = 541,869.52
  5. Step 5: Solve for x
    x = 541,869.52/826.77
  6. Step 6: Final answer
    x = 655.41

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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.