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Finding the Fourth Proportional to 3,318.75, 4,978.76 and 1,240.22

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Solution

The fourth proportional to 3,318.75, 4,978.76 and 1,240.22 is: 1,860.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,318.75 : 4,978.76 = 1,240.22 : x
  2. Step 2: Convert to fraction form
    3,318.75/4,978.76 = 1,240.22/x
  3. Step 3: Cross multiply
    3,318.75x = 4,978.76 × 1,240.22
  4. Step 4: Simplify right side
    3,318.75x = 6,174,726.63
  5. Step 5: Solve for x
    x = 6,174,726.63/3,318.75
  6. Step 6: Final answer
    x = 1,860.56

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1.5x scale

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.