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Finding the Fourth Proportional to 611.76, 916.86 and 303.72

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Solution

The fourth proportional to 611.76, 916.86 and 303.72 is: 455.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.76 : 916.86 = 303.72 : x
  2. Step 2: Convert to fraction form
    611.76/916.86 = 303.72/x
  3. Step 3: Cross multiply
    611.76x = 916.86 × 303.72
  4. Step 4: Simplify right side
    611.76x = 278,468.72
  5. Step 5: Solve for x
    x = 278,468.72/611.76
  6. Step 6: Final answer
    x = 455.19

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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.