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Finding the Fourth Proportional to 455.32, 681.20 and 388.59

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Solution

The fourth proportional to 455.32, 681.20 and 388.59 is: 581.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.32 : 681.20 = 388.59 : x
  2. Step 2: Convert to fraction form
    455.32/681.20 = 388.59/x
  3. Step 3: Cross multiply
    455.32x = 681.20 × 388.59
  4. Step 4: Simplify right side
    455.32x = 264,705.57
  5. Step 5: Solve for x
    x = 264,705.57/455.32
  6. Step 6: Final answer
    x = 581.37

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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.