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Finding the Fourth Proportional to 686.93, 948.05 and 388.23

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Solution

The fourth proportional to 686.93, 948.05 and 388.23 is: 535.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.93 : 948.05 = 388.23 : x
  2. Step 2: Convert to fraction form
    686.93/948.05 = 388.23/x
  3. Step 3: Cross multiply
    686.93x = 948.05 × 388.23
  4. Step 4: Simplify right side
    686.93x = 368,061.45
  5. Step 5: Solve for x
    x = 368,061.45/686.93
  6. Step 6: Final answer
    x = 535.81

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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.