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Finding the Fourth Proportional to 741.42, 1,110.78 and 307.80

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Solution

The fourth proportional to 741.42, 1,110.78 and 307.80 is: 461.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.42 : 1,110.78 = 307.80 : x
  2. Step 2: Convert to fraction form
    741.42/1,110.78 = 307.80/x
  3. Step 3: Cross multiply
    741.42x = 1,110.78 × 307.80
  4. Step 4: Simplify right side
    741.42x = 341,898.08
  5. Step 5: Solve for x
    x = 341,898.08/741.42
  6. Step 6: Final answer
    x = 461.14

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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.