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Finding the Fourth Proportional to 1,537.72, 2,121.88 and 874.40

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Solution

The fourth proportional to 1,537.72, 2,121.88 and 874.40 is: 1,206.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,537.72 : 2,121.88 = 874.40 : x
  2. Step 2: Convert to fraction form
    1,537.72/2,121.88 = 874.40/x
  3. Step 3: Cross multiply
    1,537.72x = 2,121.88 × 874.40
  4. Step 4: Simplify right side
    1,537.72x = 1,855,371.87
  5. Step 5: Solve for x
    x = 1,855,371.87/1,537.72
  6. Step 6: Final answer
    x = 1,206.57

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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.