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Finding the Fourth Proportional to 611.74, 917.64 and 380.48

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Solution

The fourth proportional to 611.74, 917.64 and 380.48 is: 570.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.74 : 917.64 = 380.48 : x
  2. Step 2: Convert to fraction form
    611.74/917.64 = 380.48/x
  3. Step 3: Cross multiply
    611.74x = 917.64 × 380.48
  4. Step 4: Simplify right side
    611.74x = 349,143.67
  5. Step 5: Solve for x
    x = 349,143.67/611.74
  6. Step 6: Final answer
    x = 570.74

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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.