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Finding the Fourth Proportional to 1,146.70, 1,720.05 and 1,135.90

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Solution

The fourth proportional to 1,146.70, 1,720.05 and 1,135.90 is: 1,703.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,146.70 : 1,720.05 = 1,135.90 : x
  2. Step 2: Convert to fraction form
    1,146.70/1,720.05 = 1,135.90/x
  3. Step 3: Cross multiply
    1,146.70x = 1,720.05 × 1,135.90
  4. Step 4: Simplify right side
    1,146.70x = 1,953,804.80
  5. Step 5: Solve for x
    x = 1,953,804.80/1,146.70
  6. Step 6: Final answer
    x = 1,703.85

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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.