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Finding the Fourth Proportional to 720.43, 993.95 and 455.17

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Solution

The fourth proportional to 720.43, 993.95 and 455.17 is: 627.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.43 : 993.95 = 455.17 : x
  2. Step 2: Convert to fraction form
    720.43/993.95 = 455.17/x
  3. Step 3: Cross multiply
    720.43x = 993.95 × 455.17
  4. Step 4: Simplify right side
    720.43x = 452,416.99
  5. Step 5: Solve for x
    x = 452,416.99/720.43
  6. Step 6: Final answer
    x = 627.98

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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.