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Finding the Fourth Proportional to 938.09, 1,405.31 and 612.47

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Solution

The fourth proportional to 938.09, 1,405.31 and 612.47 is: 917.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.09 : 1,405.31 = 612.47 : x
  2. Step 2: Convert to fraction form
    938.09/1,405.31 = 612.47/x
  3. Step 3: Cross multiply
    938.09x = 1,405.31 × 612.47
  4. Step 4: Simplify right side
    938.09x = 860,707.15
  5. Step 5: Solve for x
    x = 860,707.15/938.09
  6. Step 6: Final answer
    x = 917.51

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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.