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Finding the Fourth Proportional to 388.76, 582.84 and 172.32

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Solution

The fourth proportional to 388.76, 582.84 and 172.32 is: 258.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.76 : 582.84 = 172.32 : x
  2. Step 2: Convert to fraction form
    388.76/582.84 = 172.32/x
  3. Step 3: Cross multiply
    388.76x = 582.84 × 172.32
  4. Step 4: Simplify right side
    388.76x = 100,434.99
  5. Step 5: Solve for x
    x = 100,434.99/388.76
  6. Step 6: Final answer
    x = 258.35

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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.