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Finding the Fourth Proportional to 1,537.79, 2,122.20 and 874.58

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Solution

The fourth proportional to 1,537.79, 2,122.20 and 874.58 is: 1,206.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,537.79 : 2,122.20 = 874.58 : x
  2. Step 2: Convert to fraction form
    1,537.79/2,122.20 = 874.58/x
  3. Step 3: Cross multiply
    1,537.79x = 2,122.20 × 874.58
  4. Step 4: Simplify right side
    1,537.79x = 1,856,023.07
  5. Step 5: Solve for x
    x = 1,856,023.07/1,537.79
  6. Step 6: Final answer
    x = 1,206.95

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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.