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Finding the Fourth Proportional to 2,214.16, 3,320.70 and 916

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Solution

The fourth proportional to 2,214.16, 3,320.70 and 916 is: 1,373.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,214.16 : 3,320.70 = 916 : x
  2. Step 2: Convert to fraction form
    2,214.16/3,320.70 = 916/x
  3. Step 3: Cross multiply
    2,214.16x = 3,320.70 × 916
  4. Step 4: Simplify right side
    2,214.16x = 3,041,761.20
  5. Step 5: Solve for x
    x = 3,041,761.20/2,214.16
  6. Step 6: Final answer
    x = 1,373.78

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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.