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Finding the Fourth Proportional to 1,395.81, 2,093.75 and 421.91

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Solution

The fourth proportional to 1,395.81, 2,093.75 and 421.91 is: 632.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.81 : 2,093.75 = 421.91 : x
  2. Step 2: Convert to fraction form
    1,395.81/2,093.75 = 421.91/x
  3. Step 3: Cross multiply
    1,395.81x = 2,093.75 × 421.91
  4. Step 4: Simplify right side
    1,395.81x = 883,374.06
  5. Step 5: Solve for x
    x = 883,374.06/1,395.81
  6. Step 6: Final answer
    x = 632.88

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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.