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Finding the Fourth Proportional to 632.79, 947.79 and 388.59

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Solution

The fourth proportional to 632.79, 947.79 and 388.59 is: 582.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    632.79 : 947.79 = 388.59 : x
  2. Step 2: Convert to fraction form
    632.79/947.79 = 388.59/x
  3. Step 3: Cross multiply
    632.79x = 947.79 × 388.59
  4. Step 4: Simplify right side
    632.79x = 368,301.72
  5. Step 5: Solve for x
    x = 368,301.72/632.79
  6. Step 6: Final answer
    x = 582.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.