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Finding the Fourth Proportional to 917.56, 1,375.28 and 455.64

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Solution

The fourth proportional to 917.56, 1,375.28 and 455.64 is: 682.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.56 : 1,375.28 = 455.64 : x
  2. Step 2: Convert to fraction form
    917.56/1,375.28 = 455.64/x
  3. Step 3: Cross multiply
    917.56x = 1,375.28 × 455.64
  4. Step 4: Simplify right side
    917.56x = 626,632.58
  5. Step 5: Solve for x
    x = 626,632.58/917.56
  6. Step 6: Final answer
    x = 682.93

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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.