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Finding the Fourth Proportional to 716.90, 989.98 and 455

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Solution

The fourth proportional to 716.90, 989.98 and 455 is: 628.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.90 : 989.98 = 455 : x
  2. Step 2: Convert to fraction form
    716.90/989.98 = 455/x
  3. Step 3: Cross multiply
    716.90x = 989.98 × 455
  4. Step 4: Simplify right side
    716.90x = 450,440.90
  5. Step 5: Solve for x
    x = 450,440.90/716.90
  6. Step 6: Final answer
    x = 628.32

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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.