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Finding the Fourth Proportional to 628.71, 865.08 and 612.61

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Solution

The fourth proportional to 628.71, 865.08 and 612.61 is: 842.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.71 : 865.08 = 612.61 : x
  2. Step 2: Convert to fraction form
    628.71/865.08 = 612.61/x
  3. Step 3: Cross multiply
    628.71x = 865.08 × 612.61
  4. Step 4: Simplify right side
    628.71x = 529,959.36
  5. Step 5: Solve for x
    x = 529,959.36/628.71
  6. Step 6: Final answer
    x = 842.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.