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Finding the Fourth Proportional to 1,287.13, 1,931.64 and 995.37

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Solution

The fourth proportional to 1,287.13, 1,931.64 and 995.37 is: 1,493.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.13 : 1,931.64 = 995.37 : x
  2. Step 2: Convert to fraction form
    1,287.13/1,931.64 = 995.37/x
  3. Step 3: Cross multiply
    1,287.13x = 1,931.64 × 995.37
  4. Step 4: Simplify right side
    1,287.13x = 1,922,696.51
  5. Step 5: Solve for x
    x = 1,922,696.51/1,287.13
  6. Step 6: Final answer
    x = 1,493.79

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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.