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Finding the Fourth Proportional to 1,551.99, 2,139.99 and 1,197.11

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Solution

The fourth proportional to 1,551.99, 2,139.99 and 1,197.11 is: 1,650.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,551.99 : 2,139.99 = 1,197.11 : x
  2. Step 2: Convert to fraction form
    1,551.99/2,139.99 = 1,197.11/x
  3. Step 3: Cross multiply
    1,551.99x = 2,139.99 × 1,197.11
  4. Step 4: Simplify right side
    1,551.99x = 2,561,792.73
  5. Step 5: Solve for x
    x = 2,561,792.73/1,551.99
  6. Step 6: Final answer
    x = 1,650.65

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1.5x scale

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.