Home / 1,190.14-1,785.18-420.64

Finding the Fourth Proportional to 1,190.14, 1,785.18 and 420.64

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Solution

The fourth proportional to 1,190.14, 1,785.18 and 420.64 is: 630.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.14 : 1,785.18 = 420.64 : x
  2. Step 2: Convert to fraction form
    1,190.14/1,785.18 = 420.64/x
  3. Step 3: Cross multiply
    1,190.14x = 1,785.18 × 420.64
  4. Step 4: Simplify right side
    1,190.14x = 750,918.12
  5. Step 5: Solve for x
    x = 750,918.12/1,190.14
  6. Step 6: Final answer
    x = 630.95

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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.