Home / 1,311.39-1,967.85-490.23

Finding the Fourth Proportional to 1,311.39, 1,967.85 and 490.23

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Solution

The fourth proportional to 1,311.39, 1,967.85 and 490.23 is: 735.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.39 : 1,967.85 = 490.23 : x
  2. Step 2: Convert to fraction form
    1,311.39/1,967.85 = 490.23/x
  3. Step 3: Cross multiply
    1,311.39x = 1,967.85 × 490.23
  4. Step 4: Simplify right side
    1,311.39x = 964,699.11
  5. Step 5: Solve for x
    x = 964,699.11/1,311.39
  6. Step 6: Final answer
    x = 735.63

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Double scale
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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.