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Finding the Fourth Proportional to 741.61, 1,111.88 and 279.35

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Solution

The fourth proportional to 741.61, 1,111.88 and 279.35 is: 418.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.61 : 1,111.88 = 279.35 : x
  2. Step 2: Convert to fraction form
    741.61/1,111.88 = 279.35/x
  3. Step 3: Cross multiply
    741.61x = 1,111.88 × 279.35
  4. Step 4: Simplify right side
    741.61x = 310,607.16
  5. Step 5: Solve for x
    x = 310,607.16/741.61
  6. Step 6: Final answer
    x = 418.83

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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.