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Finding the Fourth Proportional to 1,545, 2,131.90 and 985.56

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Solution

The fourth proportional to 1,545, 2,131.90 and 985.56 is: 1,359.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,545 : 2,131.90 = 985.56 : x
  2. Step 2: Convert to fraction form
    1,545/2,131.90 = 985.56/x
  3. Step 3: Cross multiply
    1,545x = 2,131.90 × 985.56
  4. Step 4: Simplify right side
    1,545x = 2,101,115.36
  5. Step 5: Solve for x
    x = 2,101,115.36/1,545
  6. Step 6: Final answer
    x = 1,359.95

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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.