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Finding the Fourth Proportional to 841.79, 1,255.91 and 749.45

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Solution

The fourth proportional to 841.79, 1,255.91 and 749.45 is: 1,118.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.79 : 1,255.91 = 749.45 : x
  2. Step 2: Convert to fraction form
    841.79/1,255.91 = 749.45/x
  3. Step 3: Cross multiply
    841.79x = 1,255.91 × 749.45
  4. Step 4: Simplify right side
    841.79x = 941,241.14
  5. Step 5: Solve for x
    x = 941,241.14/841.79
  6. Step 6: Final answer
    x = 1,118.14

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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.