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Finding the Fourth Proportional to 798.58, 1,101.80 and 499.88

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Solution

The fourth proportional to 798.58, 1,101.80 and 499.88 is: 689.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.58 : 1,101.80 = 499.88 : x
  2. Step 2: Convert to fraction form
    798.58/1,101.80 = 499.88/x
  3. Step 3: Cross multiply
    798.58x = 1,101.80 × 499.88
  4. Step 4: Simplify right side
    798.58x = 550,759.78
  5. Step 5: Solve for x
    x = 550,759.78/798.58
  6. Step 6: Final answer
    x = 689.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.