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Finding the Fourth Proportional to 1,145.83, 1,719.51 and 991.53

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Solution

The fourth proportional to 1,145.83, 1,719.51 and 991.53 is: 1,487.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.83 : 1,719.51 = 991.53 : x
  2. Step 2: Convert to fraction form
    1,145.83/1,719.51 = 991.53/x
  3. Step 3: Cross multiply
    1,145.83x = 1,719.51 × 991.53
  4. Step 4: Simplify right side
    1,145.83x = 1,704,945.75
  5. Step 5: Solve for x
    x = 1,704,945.75/1,145.83
  6. Step 6: Final answer
    x = 1,487.96

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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.