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Finding the Fourth Proportional to 1,313.79, 1,970.49 and 491.88

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Solution

The fourth proportional to 1,313.79, 1,970.49 and 491.88 is: 737.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.79 : 1,970.49 = 491.88 : x
  2. Step 2: Convert to fraction form
    1,313.79/1,970.49 = 491.88/x
  3. Step 3: Cross multiply
    1,313.79x = 1,970.49 × 491.88
  4. Step 4: Simplify right side
    1,313.79x = 969,244.62
  5. Step 5: Solve for x
    x = 969,244.62/1,313.79
  6. Step 6: Final answer
    x = 737.75

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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.