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Finding the Fourth Proportional to 518.76, 781.03 and 357.50

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Solution

The fourth proportional to 518.76, 781.03 and 357.50 is: 538.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.76 : 781.03 = 357.50 : x
  2. Step 2: Convert to fraction form
    518.76/781.03 = 357.50/x
  3. Step 3: Cross multiply
    518.76x = 781.03 × 357.50
  4. Step 4: Simplify right side
    518.76x = 279,220.62
  5. Step 5: Solve for x
    x = 279,220.62/518.76
  6. Step 6: Final answer
    x = 538.25

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.