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Finding the Fourth Proportional to 417.52, 622.85 and 388.06

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Solution

The fourth proportional to 417.52, 622.85 and 388.06 is: 578.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.52 : 622.85 = 388.06 : x
  2. Step 2: Convert to fraction form
    417.52/622.85 = 388.06/x
  3. Step 3: Cross multiply
    417.52x = 622.85 × 388.06
  4. Step 4: Simplify right side
    417.52x = 241,703.17
  5. Step 5: Solve for x
    x = 241,703.17/417.52
  6. Step 6: Final answer
    x = 578.90

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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.