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Finding the Fourth Proportional to 699.38, 965.15 and 388.88

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Solution

The fourth proportional to 699.38, 965.15 and 388.88 is: 536.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.38 : 965.15 = 388.88 : x
  2. Step 2: Convert to fraction form
    699.38/965.15 = 388.88/x
  3. Step 3: Cross multiply
    699.38x = 965.15 × 388.88
  4. Step 4: Simplify right side
    699.38x = 375,320.76
  5. Step 5: Solve for x
    x = 375,320.76/699.38
  6. Step 6: Final answer
    x = 536.65

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1.5x scale

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.