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Finding the Fourth Proportional to 388.04, 582.05 and 99.47

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Solution

The fourth proportional to 388.04, 582.05 and 99.47 is: 149.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.04 : 582.05 = 99.47 : x
  2. Step 2: Convert to fraction form
    388.04/582.05 = 99.47/x
  3. Step 3: Cross multiply
    388.04x = 582.05 × 99.47
  4. Step 4: Simplify right side
    388.04x = 57,897.47
  5. Step 5: Solve for x
    x = 57,897.47/388.04
  6. Step 6: Final answer
    x = 149.21

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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.