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Finding the Fourth Proportional to 777.72, 1,167.04 and 291.12

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Solution

The fourth proportional to 777.72, 1,167.04 and 291.12 is: 436.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.72 : 1,167.04 = 291.12 : x
  2. Step 2: Convert to fraction form
    777.72/1,167.04 = 291.12/x
  3. Step 3: Cross multiply
    777.72x = 1,167.04 × 291.12
  4. Step 4: Simplify right side
    777.72x = 339,748.68
  5. Step 5: Solve for x
    x = 339,748.68/777.72
  6. Step 6: Final answer
    x = 436.85

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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.