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Finding the Fourth Proportional to 1,395.42, 2,093.28 and 421.50

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Solution

The fourth proportional to 1,395.42, 2,093.28 and 421.50 is: 632.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.42 : 2,093.28 = 421.50 : x
  2. Step 2: Convert to fraction form
    1,395.42/2,093.28 = 421.50/x
  3. Step 3: Cross multiply
    1,395.42x = 2,093.28 × 421.50
  4. Step 4: Simplify right side
    1,395.42x = 882,317.52
  5. Step 5: Solve for x
    x = 882,317.52/1,395.42
  6. Step 6: Final answer
    x = 632.30

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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.