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Finding the Fourth Proportional to 798.12, 1,101.54 and 487.80

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Solution

The fourth proportional to 798.12, 1,101.54 and 487.80 is: 673.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.12 : 1,101.54 = 487.80 : x
  2. Step 2: Convert to fraction form
    798.12/1,101.54 = 487.80/x
  3. Step 3: Cross multiply
    798.12x = 1,101.54 × 487.80
  4. Step 4: Simplify right side
    798.12x = 537,331.21
  5. Step 5: Solve for x
    x = 537,331.21/798.12
  6. Step 6: Final answer
    x = 673.25

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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.