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Finding the Fourth Proportional to 945.69, 1,419.93 and 742.74

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Solution

The fourth proportional to 945.69, 1,419.93 and 742.74 is: 1,115.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.69 : 1,419.93 = 742.74 : x
  2. Step 2: Convert to fraction form
    945.69/1,419.93 = 742.74/x
  3. Step 3: Cross multiply
    945.69x = 1,419.93 × 742.74
  4. Step 4: Simplify right side
    945.69x = 1,054,638.81
  5. Step 5: Solve for x
    x = 1,054,638.81/945.69
  6. Step 6: Final answer
    x = 1,115.21

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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.