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Finding the Fourth Proportional to 486.93, 671.20 and 381.77

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Solution

The fourth proportional to 486.93, 671.20 and 381.77 is: 526.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.93 : 671.20 = 381.77 : x
  2. Step 2: Convert to fraction form
    486.93/671.20 = 381.77/x
  3. Step 3: Cross multiply
    486.93x = 671.20 × 381.77
  4. Step 4: Simplify right side
    486.93x = 256,244.02
  5. Step 5: Solve for x
    x = 256,244.02/486.93
  6. Step 6: Final answer
    x = 526.24

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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.