Home / 1,420.38-1,964.23-1,355.11

Finding the Fourth Proportional to 1,420.38, 1,964.23 and 1,355.11

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Solution

The fourth proportional to 1,420.38, 1,964.23 and 1,355.11 is: 1,873.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.38 : 1,964.23 = 1,355.11 : x
  2. Step 2: Convert to fraction form
    1,420.38/1,964.23 = 1,355.11/x
  3. Step 3: Cross multiply
    1,420.38x = 1,964.23 × 1,355.11
  4. Step 4: Simplify right side
    1,420.38x = 2,661,739.42
  5. Step 5: Solve for x
    x = 2,661,739.42/1,420.38
  6. Step 6: Final answer
    x = 1,873.96

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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.