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Finding the Fourth Proportional to 611.80, 917.70 and 303.70

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Solution

The fourth proportional to 611.80, 917.70 and 303.70 is: 455.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.80 : 917.70 = 303.70 : x
  2. Step 2: Convert to fraction form
    611.80/917.70 = 303.70/x
  3. Step 3: Cross multiply
    611.80x = 917.70 × 303.70
  4. Step 4: Simplify right side
    611.80x = 278,705.49
  5. Step 5: Solve for x
    x = 278,705.49/611.80
  6. Step 6: Final answer
    x = 455.55

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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.