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Finding the Fourth Proportional to 518.40, 776.10 and 342.90

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Solution

The fourth proportional to 518.40, 776.10 and 342.90 is: 513.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.40 : 776.10 = 342.90 : x
  2. Step 2: Convert to fraction form
    518.40/776.10 = 342.90/x
  3. Step 3: Cross multiply
    518.40x = 776.10 × 342.90
  4. Step 4: Simplify right side
    518.40x = 266,124.69
  5. Step 5: Solve for x
    x = 266,124.69/518.40
  6. Step 6: Final answer
    x = 513.36

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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.