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Finding the Fourth Proportional to 520.85, 781.38 and 155.63

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Solution

The fourth proportional to 520.85, 781.38 and 155.63 is: 233.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.85 : 781.38 = 155.63 : x
  2. Step 2: Convert to fraction form
    520.85/781.38 = 155.63/x
  3. Step 3: Cross multiply
    520.85x = 781.38 × 155.63
  4. Step 4: Simplify right side
    520.85x = 121,602.26
  5. Step 5: Solve for x
    x = 121,602.26/520.85
  6. Step 6: Final answer
    x = 233.47

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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.