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Finding the Fourth Proportional to 893.72, 1,340.58 and 406.76

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Solution

The fourth proportional to 893.72, 1,340.58 and 406.76 is: 610.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.72 : 1,340.58 = 406.76 : x
  2. Step 2: Convert to fraction form
    893.72/1,340.58 = 406.76/x
  3. Step 3: Cross multiply
    893.72x = 1,340.58 × 406.76
  4. Step 4: Simplify right side
    893.72x = 545,294.32
  5. Step 5: Solve for x
    x = 545,294.32/893.72
  6. Step 6: Final answer
    x = 610.14

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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.