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Finding the Fourth Proportional to 714.87, 986.85 and 505.22

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Solution

The fourth proportional to 714.87, 986.85 and 505.22 is: 697.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.87 : 986.85 = 505.22 : x
  2. Step 2: Convert to fraction form
    714.87/986.85 = 505.22/x
  3. Step 3: Cross multiply
    714.87x = 986.85 × 505.22
  4. Step 4: Simplify right side
    714.87x = 498,571.42
  5. Step 5: Solve for x
    x = 498,571.42/714.87
  6. Step 6: Final answer
    x = 697.43

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Double scale
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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.