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Finding the Fourth Proportional to 611.66, 917.49 and 407.54

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Solution

The fourth proportional to 611.66, 917.49 and 407.54 is: 611.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.66 : 917.49 = 407.54 : x
  2. Step 2: Convert to fraction form
    611.66/917.49 = 407.54/x
  3. Step 3: Cross multiply
    611.66x = 917.49 × 407.54
  4. Step 4: Simplify right side
    611.66x = 373,913.87
  5. Step 5: Solve for x
    x = 373,913.87/611.66
  6. Step 6: Final answer
    x = 611.31

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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.