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Finding the Fourth Proportional to 1,313.92, 1,971.20 and 376.88

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Solution

The fourth proportional to 1,313.92, 1,971.20 and 376.88 is: 565.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.92 : 1,971.20 = 376.88 : x
  2. Step 2: Convert to fraction form
    1,313.92/1,971.20 = 376.88/x
  3. Step 3: Cross multiply
    1,313.92x = 1,971.20 × 376.88
  4. Step 4: Simplify right side
    1,313.92x = 742,905.86
  5. Step 5: Solve for x
    x = 742,905.86/1,313.92
  6. Step 6: Final answer
    x = 565.41

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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.