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Finding the Fourth Proportional to 1,311.47, 1,967.99 and 490.32

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Solution

The fourth proportional to 1,311.47, 1,967.99 and 490.32 is: 735.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.47 : 1,967.99 = 490.32 : x
  2. Step 2: Convert to fraction form
    1,311.47/1,967.99 = 490.32/x
  3. Step 3: Cross multiply
    1,311.47x = 1,967.99 × 490.32
  4. Step 4: Simplify right side
    1,311.47x = 964,944.86
  5. Step 5: Solve for x
    x = 964,944.86/1,311.47
  6. Step 6: Final answer
    x = 735.77

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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.