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Finding the Fourth Proportional to 699.13, 964.85 and 388.61

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Solution

The fourth proportional to 699.13, 964.85 and 388.61 is: 536.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.13 : 964.85 = 388.61 : x
  2. Step 2: Convert to fraction form
    699.13/964.85 = 388.61/x
  3. Step 3: Cross multiply
    699.13x = 964.85 × 388.61
  4. Step 4: Simplify right side
    699.13x = 374,948.42
  5. Step 5: Solve for x
    x = 374,948.42/699.13
  6. Step 6: Final answer
    x = 536.31

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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.