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Finding the Fourth Proportional to 1,287.02, 1,927.26 and 1,080.50

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Solution

The fourth proportional to 1,287.02, 1,927.26 and 1,080.50 is: 1,618.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.02 : 1,927.26 = 1,080.50 : x
  2. Step 2: Convert to fraction form
    1,287.02/1,927.26 = 1,080.50/x
  3. Step 3: Cross multiply
    1,287.02x = 1,927.26 × 1,080.50
  4. Step 4: Simplify right side
    1,287.02x = 2,082,404.43
  5. Step 5: Solve for x
    x = 2,082,404.43/1,287.02
  6. Step 6: Final answer
    x = 1,618.00

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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.