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Finding the Fourth Proportional to 415.99, 572.70 and 388.42

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Solution

The fourth proportional to 415.99, 572.70 and 388.42 is: 534.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.99 : 572.70 = 388.42 : x
  2. Step 2: Convert to fraction form
    415.99/572.70 = 388.42/x
  3. Step 3: Cross multiply
    415.99x = 572.70 × 388.42
  4. Step 4: Simplify right side
    415.99x = 222,448.13
  5. Step 5: Solve for x
    x = 222,448.13/415.99
  6. Step 6: Final answer
    x = 534.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.