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Finding the Fourth Proportional to 918.96, 1,378.95 and 610.95

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Solution

The fourth proportional to 918.96, 1,378.95 and 610.95 is: 916.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.96 : 1,378.95 = 610.95 : x
  2. Step 2: Convert to fraction form
    918.96/1,378.95 = 610.95/x
  3. Step 3: Cross multiply
    918.96x = 1,378.95 × 610.95
  4. Step 4: Simplify right side
    918.96x = 842,469.50
  5. Step 5: Solve for x
    x = 842,469.50/918.96
  6. Step 6: Final answer
    x = 916.76

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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.