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Finding the Fourth Proportional to 699, 964.68 and 388.56

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Solution

The fourth proportional to 699, 964.68 and 388.56 is: 536.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    699 : 964.68 = 388.56 : x
  2. Step 2: Convert to fraction form
    699/964.68 = 388.56/x
  3. Step 3: Cross multiply
    699x = 964.68 × 388.56
  4. Step 4: Simplify right side
    699x = 374,836.06
  5. Step 5: Solve for x
    x = 374,836.06/699
  6. Step 6: Final answer
    x = 536.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.