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Finding the Fourth Proportional to 699.36, 965.16 and 388.86

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Solution

The fourth proportional to 699.36, 965.16 and 388.86 is: 536.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.36 : 965.16 = 388.86 : x
  2. Step 2: Convert to fraction form
    699.36/965.16 = 388.86/x
  3. Step 3: Cross multiply
    699.36x = 965.16 × 388.86
  4. Step 4: Simplify right side
    699.36x = 375,312.12
  5. Step 5: Solve for x
    x = 375,312.12/699.36
  6. Step 6: Final answer
    x = 536.65

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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.