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Finding the Fourth Proportional to 1,313.27, 1,970.28 and 388.85

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Solution

The fourth proportional to 1,313.27, 1,970.28 and 388.85 is: 583.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.27 : 1,970.28 = 388.85 : x
  2. Step 2: Convert to fraction form
    1,313.27/1,970.28 = 388.85/x
  3. Step 3: Cross multiply
    1,313.27x = 1,970.28 × 388.85
  4. Step 4: Simplify right side
    1,313.27x = 766,142.37
  5. Step 5: Solve for x
    x = 766,142.37/1,313.27
  6. Step 6: Final answer
    x = 583.39

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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.