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Finding the Fourth Proportional to 477.81, 659.19 and 291.21

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Solution

The fourth proportional to 477.81, 659.19 and 291.21 is: 401.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    477.81 : 659.19 = 291.21 : x
  2. Step 2: Convert to fraction form
    477.81/659.19 = 291.21/x
  3. Step 3: Cross multiply
    477.81x = 659.19 × 291.21
  4. Step 4: Simplify right side
    477.81x = 191,962.72
  5. Step 5: Solve for x
    x = 191,962.72/477.81
  6. Step 6: Final answer
    x = 401.76

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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.