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Finding the Fourth Proportional to 1,395.76, 2,093.76 and 421.78

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Solution

The fourth proportional to 1,395.76, 2,093.76 and 421.78 is: 632.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.76 : 2,093.76 = 421.78 : x
  2. Step 2: Convert to fraction form
    1,395.76/2,093.76 = 421.78/x
  3. Step 3: Cross multiply
    1,395.76x = 2,093.76 × 421.78
  4. Step 4: Simplify right side
    1,395.76x = 883,106.09
  5. Step 5: Solve for x
    x = 883,106.09/1,395.76
  6. Step 6: Final answer
    x = 632.71

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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.