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Finding the Fourth Proportional to 665.33, 917.76 and 455.40

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Solution

The fourth proportional to 665.33, 917.76 and 455.40 is: 628.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.33 : 917.76 = 455.40 : x
  2. Step 2: Convert to fraction form
    665.33/917.76 = 455.40/x
  3. Step 3: Cross multiply
    665.33x = 917.76 × 455.40
  4. Step 4: Simplify right side
    665.33x = 417,947.90
  5. Step 5: Solve for x
    x = 417,947.90/665.33
  6. Step 6: Final answer
    x = 628.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.