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Finding the Fourth Proportional to 518.31, 776.55 and 312.60

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Solution

The fourth proportional to 518.31, 776.55 and 312.60 is: 468.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.31 : 776.55 = 312.60 : x
  2. Step 2: Convert to fraction form
    518.31/776.55 = 312.60/x
  3. Step 3: Cross multiply
    518.31x = 776.55 × 312.60
  4. Step 4: Simplify right side
    518.31x = 242,744.08
  5. Step 5: Solve for x
    x = 242,744.08/518.31
  6. Step 6: Final answer
    x = 468.34

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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.