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Finding the Fourth Proportional to 611.79, 917.20 and 303.56

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Solution

The fourth proportional to 611.79, 917.20 and 303.56 is: 455.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.79 : 917.20 = 303.56 : x
  2. Step 2: Convert to fraction form
    611.79/917.20 = 303.56/x
  3. Step 3: Cross multiply
    611.79x = 917.20 × 303.56
  4. Step 4: Simplify right side
    611.79x = 278,423.61
  5. Step 5: Solve for x
    x = 278,423.61/611.79
  6. Step 6: Final answer
    x = 455.10

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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.