Home / 3,178.25-4,385.99-1,781.45

Finding the Fourth Proportional to 3,178.25, 4,385.99 and 1,781.45

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Solution

The fourth proportional to 3,178.25, 4,385.99 and 1,781.45 is: 2,458.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,178.25 : 4,385.99 = 1,781.45 : x
  2. Step 2: Convert to fraction form
    3,178.25/4,385.99 = 1,781.45/x
  3. Step 3: Cross multiply
    3,178.25x = 4,385.99 × 1,781.45
  4. Step 4: Simplify right side
    3,178.25x = 7,813,421.89
  5. Step 5: Solve for x
    x = 7,813,421.89/3,178.25
  6. Step 6: Final answer
    x = 2,458.40

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1.5x scale

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.