Home / 1,357.38-2,035.49-420.21

Finding the Fourth Proportional to 1,357.38, 2,035.49 and 420.21

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Solution

The fourth proportional to 1,357.38, 2,035.49 and 420.21 is: 630.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,357.38 : 2,035.49 = 420.21 : x
  2. Step 2: Convert to fraction form
    1,357.38/2,035.49 = 420.21/x
  3. Step 3: Cross multiply
    1,357.38x = 2,035.49 × 420.21
  4. Step 4: Simplify right side
    1,357.38x = 855,331.15
  5. Step 5: Solve for x
    x = 855,331.15/1,357.38
  6. Step 6: Final answer
    x = 630.13

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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.