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Finding the Fourth Proportional to 1,619.85, 2,431.98 and 840.48

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Solution

The fourth proportional to 1,619.85, 2,431.98 and 840.48 is: 1,261.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,619.85 : 2,431.98 = 840.48 : x
  2. Step 2: Convert to fraction form
    1,619.85/2,431.98 = 840.48/x
  3. Step 3: Cross multiply
    1,619.85x = 2,431.98 × 840.48
  4. Step 4: Simplify right side
    1,619.85x = 2,044,030.55
  5. Step 5: Solve for x
    x = 2,044,030.55/1,619.85
  6. Step 6: Final answer
    x = 1,261.86

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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.