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Finding the Fourth Proportional to 1,147.64, 1,720.89 and 561.65

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Solution

The fourth proportional to 1,147.64, 1,720.89 and 561.65 is: 842.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.64 : 1,720.89 = 561.65 : x
  2. Step 2: Convert to fraction form
    1,147.64/1,720.89 = 561.65/x
  3. Step 3: Cross multiply
    1,147.64x = 1,720.89 × 561.65
  4. Step 4: Simplify right side
    1,147.64x = 966,529.26
  5. Step 5: Solve for x
    x = 966,529.26/1,147.64
  6. Step 6: Final answer
    x = 842.19

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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.