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Finding the Fourth Proportional to 1,313.38, 1,969.80 and 388.72

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Solution

The fourth proportional to 1,313.38, 1,969.80 and 388.72 is: 583.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.38 : 1,969.80 = 388.72 : x
  2. Step 2: Convert to fraction form
    1,313.38/1,969.80 = 388.72/x
  3. Step 3: Cross multiply
    1,313.38x = 1,969.80 × 388.72
  4. Step 4: Simplify right side
    1,313.38x = 765,698.89
  5. Step 5: Solve for x
    x = 765,698.89/1,313.38
  6. Step 6: Final answer
    x = 583.00

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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.