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Finding the Fourth Proportional to 1,537.56, 2,121.70 and 874.46

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Solution

The fourth proportional to 1,537.56, 2,121.70 and 874.46 is: 1,206.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,537.56 : 2,121.70 = 874.46 : x
  2. Step 2: Convert to fraction form
    1,537.56/2,121.70 = 874.46/x
  3. Step 3: Cross multiply
    1,537.56x = 2,121.70 × 874.46
  4. Step 4: Simplify right side
    1,537.56x = 1,855,341.78
  5. Step 5: Solve for x
    x = 1,855,341.78/1,537.56
  6. Step 6: Final answer
    x = 1,206.68

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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.