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Finding the Fourth Proportional to 611.07, 917.28 and 455.46

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Solution

The fourth proportional to 611.07, 917.28 and 455.46 is: 683.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.07 : 917.28 = 455.46 : x
  2. Step 2: Convert to fraction form
    611.07/917.28 = 455.46/x
  3. Step 3: Cross multiply
    611.07x = 917.28 × 455.46
  4. Step 4: Simplify right side
    611.07x = 417,784.35
  5. Step 5: Solve for x
    x = 417,784.35/611.07
  6. Step 6: Final answer
    x = 683.69

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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.