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Finding the Fourth Proportional to 995.30, 1,373.89 and 646

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Solution

The fourth proportional to 995.30, 1,373.89 and 646 is: 891.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.30 : 1,373.89 = 646 : x
  2. Step 2: Convert to fraction form
    995.30/1,373.89 = 646/x
  3. Step 3: Cross multiply
    995.30x = 1,373.89 × 646
  4. Step 4: Simplify right side
    995.30x = 887,532.94
  5. Step 5: Solve for x
    x = 887,532.94/995.30
  6. Step 6: Final answer
    x = 891.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.