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Finding the Fourth Proportional to 454.16, 681.31 and 145.91

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Solution

The fourth proportional to 454.16, 681.31 and 145.91 is: 218.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    454.16 : 681.31 = 145.91 : x
  2. Step 2: Convert to fraction form
    454.16/681.31 = 145.91/x
  3. Step 3: Cross multiply
    454.16x = 681.31 × 145.91
  4. Step 4: Simplify right side
    454.16x = 99,412.79
  5. Step 5: Solve for x
    x = 99,412.79/454.16
  6. Step 6: Final answer
    x = 218.89

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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.