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Finding the Fourth Proportional to 521.07, 781.61 and 164.91

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Solution

The fourth proportional to 521.07, 781.61 and 164.91 is: 247.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.07 : 781.61 = 164.91 : x
  2. Step 2: Convert to fraction form
    521.07/781.61 = 164.91/x
  3. Step 3: Cross multiply
    521.07x = 781.61 × 164.91
  4. Step 4: Simplify right side
    521.07x = 128,894.48
  5. Step 5: Solve for x
    x = 128,894.48/521.07
  6. Step 6: Final answer
    x = 247.37

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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.