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Finding the Fourth Proportional to 699.16, 964.78 and 388.68

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Solution

The fourth proportional to 699.16, 964.78 and 388.68 is: 536.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.16 : 964.78 = 388.68 : x
  2. Step 2: Convert to fraction form
    699.16/964.78 = 388.68/x
  3. Step 3: Cross multiply
    699.16x = 964.78 × 388.68
  4. Step 4: Simplify right side
    699.16x = 374,990.69
  5. Step 5: Solve for x
    x = 374,990.69/699.16
  6. Step 6: Final answer
    x = 536.34

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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.