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Finding the Fourth Proportional to 1,429.71, 2,142.87 and 551.67

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Solution

The fourth proportional to 1,429.71, 2,142.87 and 551.67 is: 826.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,429.71 : 2,142.87 = 551.67 : x
  2. Step 2: Convert to fraction form
    1,429.71/2,142.87 = 551.67/x
  3. Step 3: Cross multiply
    1,429.71x = 2,142.87 × 551.67
  4. Step 4: Simplify right side
    1,429.71x = 1,182,157.09
  5. Step 5: Solve for x
    x = 1,182,157.09/1,429.71
  6. Step 6: Final answer
    x = 826.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.