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Finding the Fourth Proportional to 717.57, 990.27 and 455.31

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Solution

The fourth proportional to 717.57, 990.27 and 455.31 is: 628.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.57 : 990.27 = 455.31 : x
  2. Step 2: Convert to fraction form
    717.57/990.27 = 455.31/x
  3. Step 3: Cross multiply
    717.57x = 990.27 × 455.31
  4. Step 4: Simplify right side
    717.57x = 450,879.83
  5. Step 5: Solve for x
    x = 450,879.83/717.57
  6. Step 6: Final answer
    x = 628.34

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1.5x scale

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.