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Finding the Fourth Proportional to 628.96, 938.32 and 612.86

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Solution

The fourth proportional to 628.96, 938.32 and 612.86 is: 914.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.96 : 938.32 = 612.86 : x
  2. Step 2: Convert to fraction form
    628.96/938.32 = 612.86/x
  3. Step 3: Cross multiply
    628.96x = 938.32 × 612.86
  4. Step 4: Simplify right side
    628.96x = 575,058.80
  5. Step 5: Solve for x
    x = 575,058.80/628.96
  6. Step 6: Final answer
    x = 914.30

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.