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Finding the Fourth Proportional to 2,151.96, 3,228.36 and 918.96

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Solution

The fourth proportional to 2,151.96, 3,228.36 and 918.96 is: 1,378.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,151.96 : 3,228.36 = 918.96 : x
  2. Step 2: Convert to fraction form
    2,151.96/3,228.36 = 918.96/x
  3. Step 3: Cross multiply
    2,151.96x = 3,228.36 × 918.96
  4. Step 4: Simplify right side
    2,151.96x = 2,966,733.71
  5. Step 5: Solve for x
    x = 2,966,733.71/2,151.96
  6. Step 6: Final answer
    x = 1,378.62

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1.5x scale

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.