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Finding the Fourth Proportional to 521.99, 781.16 and 434.51

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Solution

The fourth proportional to 521.99, 781.16 and 434.51 is: 650.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.99 : 781.16 = 434.51 : x
  2. Step 2: Convert to fraction form
    521.99/781.16 = 434.51/x
  3. Step 3: Cross multiply
    521.99x = 781.16 × 434.51
  4. Step 4: Simplify right side
    521.99x = 339,415.75
  5. Step 5: Solve for x
    x = 339,415.75/521.99
  6. Step 6: Final answer
    x = 650.24

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Double scale
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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.