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Finding the Fourth Proportional to 1,440.50, 1,987.87 and 811.03

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Solution

The fourth proportional to 1,440.50, 1,987.87 and 811.03 is: 1,119.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.50 : 1,987.87 = 811.03 : x
  2. Step 2: Convert to fraction form
    1,440.50/1,987.87 = 811.03/x
  3. Step 3: Cross multiply
    1,440.50x = 1,987.87 × 811.03
  4. Step 4: Simplify right side
    1,440.50x = 1,612,220.46
  5. Step 5: Solve for x
    x = 1,612,220.46/1,440.50
  6. Step 6: Final answer
    x = 1,119.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.