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Finding the Fourth Proportional to 2,670.90, 4,005.50 and 891.59

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Solution

The fourth proportional to 2,670.90, 4,005.50 and 891.59 is: 1,337.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,670.90 : 4,005.50 = 891.59 : x
  2. Step 2: Convert to fraction form
    2,670.90/4,005.50 = 891.59/x
  3. Step 3: Cross multiply
    2,670.90x = 4,005.50 × 891.59
  4. Step 4: Simplify right side
    2,670.90x = 3,571,239.26
  5. Step 5: Solve for x
    x = 3,571,239.26/2,670.90
  6. Step 6: Final answer
    x = 1,337.09

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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.