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Finding the Fourth Proportional to 628.23, 862.50 and 612.15

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Solution

The fourth proportional to 628.23, 862.50 and 612.15 is: 840.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.23 : 862.50 = 612.15 : x
  2. Step 2: Convert to fraction form
    628.23/862.50 = 612.15/x
  3. Step 3: Cross multiply
    628.23x = 862.50 × 612.15
  4. Step 4: Simplify right side
    628.23x = 527,979.38
  5. Step 5: Solve for x
    x = 527,979.38/628.23
  6. Step 6: Final answer
    x = 840.42

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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.