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Finding the Fourth Proportional to 1,287.12, 1,930.36 and 496.32

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Solution

The fourth proportional to 1,287.12, 1,930.36 and 496.32 is: 744.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.12 : 1,930.36 = 496.32 : x
  2. Step 2: Convert to fraction form
    1,287.12/1,930.36 = 496.32/x
  3. Step 3: Cross multiply
    1,287.12x = 1,930.36 × 496.32
  4. Step 4: Simplify right side
    1,287.12x = 958,068.97
  5. Step 5: Solve for x
    x = 958,068.97/1,287.12
  6. Step 6: Final answer
    x = 744.35

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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.