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Finding the Fourth Proportional to 388.40, 579.04 and 354.20

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Solution

The fourth proportional to 388.40, 579.04 and 354.20 is: 528.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.40 : 579.04 = 354.20 : x
  2. Step 2: Convert to fraction form
    388.40/579.04 = 354.20/x
  3. Step 3: Cross multiply
    388.40x = 579.04 × 354.20
  4. Step 4: Simplify right side
    388.40x = 205,095.97
  5. Step 5: Solve for x
    x = 205,095.97/388.40
  6. Step 6: Final answer
    x = 528.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.