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Finding the Fourth Proportional to 995.37, 1,490.89 and 720.87

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Solution

The fourth proportional to 995.37, 1,490.89 and 720.87 is: 1,079.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.37 : 1,490.89 = 720.87 : x
  2. Step 2: Convert to fraction form
    995.37/1,490.89 = 720.87/x
  3. Step 3: Cross multiply
    995.37x = 1,490.89 × 720.87
  4. Step 4: Simplify right side
    995.37x = 1,074,726.82
  5. Step 5: Solve for x
    x = 1,074,726.82/995.37
  6. Step 6: Final answer
    x = 1,079.73

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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.