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Finding the Fourth Proportional to 501.03, 691.38 and 291.21

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Solution

The fourth proportional to 501.03, 691.38 and 291.21 is: 401.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.03 : 691.38 = 291.21 : x
  2. Step 2: Convert to fraction form
    501.03/691.38 = 291.21/x
  3. Step 3: Cross multiply
    501.03x = 691.38 × 291.21
  4. Step 4: Simplify right side
    501.03x = 201,336.77
  5. Step 5: Solve for x
    x = 201,336.77/501.03
  6. Step 6: Final answer
    x = 401.85

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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.