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Finding the Fourth Proportional to 611.86, 917.54 and 303.60

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Solution

The fourth proportional to 611.86, 917.54 and 303.60 is: 455.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.86 : 917.54 = 303.60 : x
  2. Step 2: Convert to fraction form
    611.86/917.54 = 303.60/x
  3. Step 3: Cross multiply
    611.86x = 917.54 × 303.60
  4. Step 4: Simplify right side
    611.86x = 278,565.14
  5. Step 5: Solve for x
    x = 278,565.14/611.86
  6. Step 6: Final answer
    x = 455.28

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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.