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Finding the Fourth Proportional to 699.48, 965.34 and 388.98

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Solution

The fourth proportional to 699.48, 965.34 and 388.98 is: 536.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.48 : 965.34 = 388.98 : x
  2. Step 2: Convert to fraction form
    699.48/965.34 = 388.98/x
  3. Step 3: Cross multiply
    699.48x = 965.34 × 388.98
  4. Step 4: Simplify right side
    699.48x = 375,497.95
  5. Step 5: Solve for x
    x = 375,497.95/699.48
  6. Step 6: Final answer
    x = 536.82

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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.