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Finding the Fourth Proportional to 995.92, 1,490.20 and 860.56

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Solution

The fourth proportional to 995.92, 1,490.20 and 860.56 is: 1,287.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.92 : 1,490.20 = 860.56 : x
  2. Step 2: Convert to fraction form
    995.92/1,490.20 = 860.56/x
  3. Step 3: Cross multiply
    995.92x = 1,490.20 × 860.56
  4. Step 4: Simplify right side
    995.92x = 1,282,406.51
  5. Step 5: Solve for x
    x = 1,282,406.51/995.92
  6. Step 6: Final answer
    x = 1,287.66

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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.