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Finding the Fourth Proportional to 1,765.71, 2,643.60 and 1,147.86

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Solution

The fourth proportional to 1,765.71, 2,643.60 and 1,147.86 is: 1,718.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,765.71 : 2,643.60 = 1,147.86 : x
  2. Step 2: Convert to fraction form
    1,765.71/2,643.60 = 1,147.86/x
  3. Step 3: Cross multiply
    1,765.71x = 2,643.60 × 1,147.86
  4. Step 4: Simplify right side
    1,765.71x = 3,034,482.70
  5. Step 5: Solve for x
    x = 3,034,482.70/1,765.71
  6. Step 6: Final answer
    x = 1,718.56

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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.