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Finding the Fourth Proportional to 919.15, 1,378.69 and 610.92

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Solution

The fourth proportional to 919.15, 1,378.69 and 610.92 is: 916.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.15 : 1,378.69 = 610.92 : x
  2. Step 2: Convert to fraction form
    919.15/1,378.69 = 610.92/x
  3. Step 3: Cross multiply
    919.15x = 1,378.69 × 610.92
  4. Step 4: Simplify right side
    919.15x = 842,267.77
  5. Step 5: Solve for x
    x = 842,267.77/919.15
  6. Step 6: Final answer
    x = 916.36

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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.