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Finding the Fourth Proportional to 388.17, 582.21 and 99.57

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Solution

The fourth proportional to 388.17, 582.21 and 99.57 is: 149.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.17 : 582.21 = 99.57 : x
  2. Step 2: Convert to fraction form
    388.17/582.21 = 99.57/x
  3. Step 3: Cross multiply
    388.17x = 582.21 × 99.57
  4. Step 4: Simplify right side
    388.17x = 57,970.65
  5. Step 5: Solve for x
    x = 57,970.65/388.17
  6. Step 6: Final answer
    x = 149.34

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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.