Home / 1,115.20-1,671.60-498.80

Finding the Fourth Proportional to 1,115.20, 1,671.60 and 498.80

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Solution

The fourth proportional to 1,115.20, 1,671.60 and 498.80 is: 747.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.20 : 1,671.60 = 498.80 : x
  2. Step 2: Convert to fraction form
    1,115.20/1,671.60 = 498.80/x
  3. Step 3: Cross multiply
    1,115.20x = 1,671.60 × 498.80
  4. Step 4: Simplify right side
    1,115.20x = 833,794.08
  5. Step 5: Solve for x
    x = 833,794.08/1,115.20
  6. Step 6: Final answer
    x = 747.66

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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.