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Finding the Fourth Proportional to 518.31, 776.88 and 287.30

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Solution

The fourth proportional to 518.31, 776.88 and 287.30 is: 430.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.31 : 776.88 = 287.30 : x
  2. Step 2: Convert to fraction form
    518.31/776.88 = 287.30/x
  3. Step 3: Cross multiply
    518.31x = 776.88 × 287.30
  4. Step 4: Simplify right side
    518.31x = 223,199.57
  5. Step 5: Solve for x
    x = 223,199.57/518.31
  6. Step 6: Final answer
    x = 430.63

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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.