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Finding the Fourth Proportional to 518.72, 710.28 and 515.12

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Solution

The fourth proportional to 518.72, 710.28 and 515.12 is: 705.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.72 : 710.28 = 515.12 : x
  2. Step 2: Convert to fraction form
    518.72/710.28 = 515.12/x
  3. Step 3: Cross multiply
    518.72x = 710.28 × 515.12
  4. Step 4: Simplify right side
    518.72x = 365,879.43
  5. Step 5: Solve for x
    x = 365,879.43/518.72
  6. Step 6: Final answer
    x = 705.35

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.