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Finding the Fourth Proportional to 1,113.70, 1,671.99 and 681.46

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Solution

The fourth proportional to 1,113.70, 1,671.99 and 681.46 is: 1,023.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.70 : 1,671.99 = 681.46 : x
  2. Step 2: Convert to fraction form
    1,113.70/1,671.99 = 681.46/x
  3. Step 3: Cross multiply
    1,113.70x = 1,671.99 × 681.46
  4. Step 4: Simplify right side
    1,113.70x = 1,139,394.31
  5. Step 5: Solve for x
    x = 1,139,394.31/1,113.70
  6. Step 6: Final answer
    x = 1,023.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.