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Finding the Fourth Proportional to 1,426.99, 2,141.70 and 561.91

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Solution

The fourth proportional to 1,426.99, 2,141.70 and 561.91 is: 843.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,426.99 : 2,141.70 = 561.91 : x
  2. Step 2: Convert to fraction form
    1,426.99/2,141.70 = 561.91/x
  3. Step 3: Cross multiply
    1,426.99x = 2,141.70 × 561.91
  4. Step 4: Simplify right side
    1,426.99x = 1,203,429.13
  5. Step 5: Solve for x
    x = 1,203,429.13/1,426.99
  6. Step 6: Final answer
    x = 843.34

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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.