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Finding the Fourth Proportional to 1,052.19, 1,451.93 and 720.90

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Solution

The fourth proportional to 1,052.19, 1,451.93 and 720.90 is: 994.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,052.19 : 1,451.93 = 720.90 : x
  2. Step 2: Convert to fraction form
    1,052.19/1,451.93 = 720.90/x
  3. Step 3: Cross multiply
    1,052.19x = 1,451.93 × 720.90
  4. Step 4: Simplify right side
    1,052.19x = 1,046,692.73
  5. Step 5: Solve for x
    x = 1,046,692.73/1,052.19
  6. Step 6: Final answer
    x = 994.78

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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.