Home / 1,211.23-1,816.17-420.22

Finding the Fourth Proportional to 1,211.23, 1,816.17 and 420.22

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Solution

The fourth proportional to 1,211.23, 1,816.17 and 420.22 is: 630.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.23 : 1,816.17 = 420.22 : x
  2. Step 2: Convert to fraction form
    1,211.23/1,816.17 = 420.22/x
  3. Step 3: Cross multiply
    1,211.23x = 1,816.17 × 420.22
  4. Step 4: Simplify right side
    1,211.23x = 763,195.85
  5. Step 5: Solve for x
    x = 763,195.85/1,211.23
  6. Step 6: Final answer
    x = 630.10

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Double scale
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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.