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Finding the Fourth Proportional to 2,561.47, 3,842.46 and 918.65

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Solution

The fourth proportional to 2,561.47, 3,842.46 and 918.65 is: 1,378.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,561.47 : 3,842.46 = 918.65 : x
  2. Step 2: Convert to fraction form
    2,561.47/3,842.46 = 918.65/x
  3. Step 3: Cross multiply
    2,561.47x = 3,842.46 × 918.65
  4. Step 4: Simplify right side
    2,561.47x = 3,529,887.66
  5. Step 5: Solve for x
    x = 3,529,887.66/2,561.47
  6. Step 6: Final answer
    x = 1,378.07

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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.