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Finding the Fourth Proportional to 388.49, 579.36 and 345.15

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Solution

The fourth proportional to 388.49, 579.36 and 345.15 is: 514.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.49 : 579.36 = 345.15 : x
  2. Step 2: Convert to fraction form
    388.49/579.36 = 345.15/x
  3. Step 3: Cross multiply
    388.49x = 579.36 × 345.15
  4. Step 4: Simplify right side
    388.49x = 199,966.10
  5. Step 5: Solve for x
    x = 199,966.10/388.49
  6. Step 6: Final answer
    x = 514.73

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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.