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Finding the Fourth Proportional to 1,537.15, 2,120.67 and 873.91

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Solution

The fourth proportional to 1,537.15, 2,120.67 and 873.91 is: 1,205.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,537.15 : 2,120.67 = 873.91 : x
  2. Step 2: Convert to fraction form
    1,537.15/2,120.67 = 873.91/x
  3. Step 3: Cross multiply
    1,537.15x = 2,120.67 × 873.91
  4. Step 4: Simplify right side
    1,537.15x = 1,853,274.72
  5. Step 5: Solve for x
    x = 1,853,274.72/1,537.15
  6. Step 6: Final answer
    x = 1,205.66

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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.