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Finding the Fourth Proportional to 716.56, 993.88 and 687.40

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Solution

The fourth proportional to 716.56, 993.88 and 687.40 is: 953.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.56 : 993.88 = 687.40 : x
  2. Step 2: Convert to fraction form
    716.56/993.88 = 687.40/x
  3. Step 3: Cross multiply
    716.56x = 993.88 × 687.40
  4. Step 4: Simplify right side
    716.56x = 683,193.11
  5. Step 5: Solve for x
    x = 683,193.11/716.56
  6. Step 6: Final answer
    x = 953.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.