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Finding the Fourth Proportional to 521.15, 781.77 and 155.93

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Solution

The fourth proportional to 521.15, 781.77 and 155.93 is: 233.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.15 : 781.77 = 155.93 : x
  2. Step 2: Convert to fraction form
    521.15/781.77 = 155.93/x
  3. Step 3: Cross multiply
    521.15x = 781.77 × 155.93
  4. Step 4: Simplify right side
    521.15x = 121,901.40
  5. Step 5: Solve for x
    x = 121,901.40/521.15
  6. Step 6: Final answer
    x = 233.91

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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.