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Finding the Fourth Proportional to 3,320.48, 4,980.65 and 855.24

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Solution

The fourth proportional to 3,320.48, 4,980.65 and 855.24 is: 1,282.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,320.48 : 4,980.65 = 855.24 : x
  2. Step 2: Convert to fraction form
    3,320.48/4,980.65 = 855.24/x
  3. Step 3: Cross multiply
    3,320.48x = 4,980.65 × 855.24
  4. Step 4: Simplify right side
    3,320.48x = 4,259,646.83
  5. Step 5: Solve for x
    x = 4,259,646.83/3,320.48
  6. Step 6: Final answer
    x = 1,282.84

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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.