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Finding the Fourth Proportional to 1,868.79, 2,579.21 and 1,113

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Solution

The fourth proportional to 1,868.79, 2,579.21 and 1,113 is: 1,536.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,868.79 : 2,579.21 = 1,113 : x
  2. Step 2: Convert to fraction form
    1,868.79/2,579.21 = 1,113/x
  3. Step 3: Cross multiply
    1,868.79x = 2,579.21 × 1,113
  4. Step 4: Simplify right side
    1,868.79x = 2,870,660.73
  5. Step 5: Solve for x
    x = 2,870,660.73/1,868.79
  6. Step 6: Final answer
    x = 1,536.11

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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.