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Finding the Fourth Proportional to 750.15, 1,126.31 and 421.74

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Solution

The fourth proportional to 750.15, 1,126.31 and 421.74 is: 633.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.15 : 1,126.31 = 421.74 : x
  2. Step 2: Convert to fraction form
    750.15/1,126.31 = 421.74/x
  3. Step 3: Cross multiply
    750.15x = 1,126.31 × 421.74
  4. Step 4: Simplify right side
    750.15x = 475,007.87
  5. Step 5: Solve for x
    x = 475,007.87/750.15
  6. Step 6: Final answer
    x = 633.22

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.