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Finding the Fourth Proportional to 698.63, 964.10 and 388.13

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Solution

The fourth proportional to 698.63, 964.10 and 388.13 is: 535.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.63 : 964.10 = 388.13 : x
  2. Step 2: Convert to fraction form
    698.63/964.10 = 388.13/x
  3. Step 3: Cross multiply
    698.63x = 964.10 × 388.13
  4. Step 4: Simplify right side
    698.63x = 374,192.28
  5. Step 5: Solve for x
    x = 374,192.28/698.63
  6. Step 6: Final answer
    x = 535.61

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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.