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Finding the Fourth Proportional to 1,458.87, 2,187.51 and 763.86

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Solution

The fourth proportional to 1,458.87, 2,187.51 and 763.86 is: 1,145.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,458.87 : 2,187.51 = 763.86 : x
  2. Step 2: Convert to fraction form
    1,458.87/2,187.51 = 763.86/x
  3. Step 3: Cross multiply
    1,458.87x = 2,187.51 × 763.86
  4. Step 4: Simplify right side
    1,458.87x = 1,670,951.39
  5. Step 5: Solve for x
    x = 1,670,951.39/1,458.87
  6. Step 6: Final answer
    x = 1,145.37

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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.