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Finding the Fourth Proportional to 2,188, 3,280.16 and 890.40

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Solution

The fourth proportional to 2,188, 3,280.16 and 890.40 is: 1,334.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,188 : 3,280.16 = 890.40 : x
  2. Step 2: Convert to fraction form
    2,188/3,280.16 = 890.40/x
  3. Step 3: Cross multiply
    2,188x = 3,280.16 × 890.40
  4. Step 4: Simplify right side
    2,188x = 2,920,654.46
  5. Step 5: Solve for x
    x = 2,920,654.46/2,188
  6. Step 6: Final answer
    x = 1,334.85

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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.