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Finding the Fourth Proportional to 893.60, 1,340.96 and 431.43

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Solution

The fourth proportional to 893.60, 1,340.96 and 431.43 is: 647.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.60 : 1,340.96 = 431.43 : x
  2. Step 2: Convert to fraction form
    893.60/1,340.96 = 431.43/x
  3. Step 3: Cross multiply
    893.60x = 1,340.96 × 431.43
  4. Step 4: Simplify right side
    893.60x = 578,530.37
  5. Step 5: Solve for x
    x = 578,530.37/893.60
  6. Step 6: Final answer
    x = 647.42

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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.