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Finding the Fourth Proportional to 1,440.13, 1,986.90 and 810.55

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Solution

The fourth proportional to 1,440.13, 1,986.90 and 810.55 is: 1,118.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.13 : 1,986.90 = 810.55 : x
  2. Step 2: Convert to fraction form
    1,440.13/1,986.90 = 810.55/x
  3. Step 3: Cross multiply
    1,440.13x = 1,986.90 × 810.55
  4. Step 4: Simplify right side
    1,440.13x = 1,610,481.80
  5. Step 5: Solve for x
    x = 1,610,481.80/1,440.13
  6. Step 6: Final answer
    x = 1,118.29

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1.5x scale

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.