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Finding the Fourth Proportional to 965.79, 1,449 and 388.71

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Solution

The fourth proportional to 965.79, 1,449 and 388.71 is: 583.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.79 : 1,449 = 388.71 : x
  2. Step 2: Convert to fraction form
    965.79/1,449 = 388.71/x
  3. Step 3: Cross multiply
    965.79x = 1,449 × 388.71
  4. Step 4: Simplify right side
    965.79x = 563,240.79
  5. Step 5: Solve for x
    x = 563,240.79/965.79
  6. Step 6: Final answer
    x = 583.19

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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.