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Finding the Fourth Proportional to 717.35, 989.75 and 455.38

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Solution

The fourth proportional to 717.35, 989.75 and 455.38 is: 628.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.35 : 989.75 = 455.38 : x
  2. Step 2: Convert to fraction form
    717.35/989.75 = 455.38/x
  3. Step 3: Cross multiply
    717.35x = 989.75 × 455.38
  4. Step 4: Simplify right side
    717.35x = 450,711.02
  5. Step 5: Solve for x
    x = 450,711.02/717.35
  6. Step 6: Final answer
    x = 628.30

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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.