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Finding the Fourth Proportional to 1,395.69, 2,093.55 and 421.77

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Solution

The fourth proportional to 1,395.69, 2,093.55 and 421.77 is: 632.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.69 : 2,093.55 = 421.77 : x
  2. Step 2: Convert to fraction form
    1,395.69/2,093.55 = 421.77/x
  3. Step 3: Cross multiply
    1,395.69x = 2,093.55 × 421.77
  4. Step 4: Simplify right side
    1,395.69x = 882,996.58
  5. Step 5: Solve for x
    x = 882,996.58/1,395.69
  6. Step 6: Final answer
    x = 632.66

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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.