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Finding the Fourth Proportional to 388.32, 582.47 and 145.13

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Solution

The fourth proportional to 388.32, 582.47 and 145.13 is: 217.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.32 : 582.47 = 145.13 : x
  2. Step 2: Convert to fraction form
    388.32/582.47 = 145.13/x
  3. Step 3: Cross multiply
    388.32x = 582.47 × 145.13
  4. Step 4: Simplify right side
    388.32x = 84,530.23
  5. Step 5: Solve for x
    x = 84,530.23/388.32
  6. Step 6: Final answer
    x = 217.68

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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.