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Finding the Fourth Proportional to 749.09, 1,121.93 and 661.50

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Solution

The fourth proportional to 749.09, 1,121.93 and 661.50 is: 990.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.09 : 1,121.93 = 661.50 : x
  2. Step 2: Convert to fraction form
    749.09/1,121.93 = 661.50/x
  3. Step 3: Cross multiply
    749.09x = 1,121.93 × 661.50
  4. Step 4: Simplify right side
    749.09x = 742,157.52
  5. Step 5: Solve for x
    x = 742,157.52/749.09
  6. Step 6: Final answer
    x = 990.74

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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.