Home / 1,178.40-1,778.20-1,135.52

Finding the Fourth Proportional to 1,178.40, 1,778.20 and 1,135.52

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Solution

The fourth proportional to 1,178.40, 1,778.20 and 1,135.52 is: 1,713.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.40 : 1,778.20 = 1,135.52 : x
  2. Step 2: Convert to fraction form
    1,178.40/1,778.20 = 1,135.52/x
  3. Step 3: Cross multiply
    1,178.40x = 1,778.20 × 1,135.52
  4. Step 4: Simplify right side
    1,178.40x = 2,019,181.66
  5. Step 5: Solve for x
    x = 2,019,181.66/1,178.40
  6. Step 6: Final answer
    x = 1,713.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.