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Finding the Fourth Proportional to 458.68, 632.28 and 388.48

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Solution

The fourth proportional to 458.68, 632.28 and 388.48 is: 535.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.68 : 632.28 = 388.48 : x
  2. Step 2: Convert to fraction form
    458.68/632.28 = 388.48/x
  3. Step 3: Cross multiply
    458.68x = 632.28 × 388.48
  4. Step 4: Simplify right side
    458.68x = 245,628.13
  5. Step 5: Solve for x
    x = 245,628.13/458.68
  6. Step 6: Final answer
    x = 535.51

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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.