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Finding the Fourth Proportional to 995.80, 1,373.88 and 664.28

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Solution

The fourth proportional to 995.80, 1,373.88 and 664.28 is: 916.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.80 : 1,373.88 = 664.28 : x
  2. Step 2: Convert to fraction form
    995.80/1,373.88 = 664.28/x
  3. Step 3: Cross multiply
    995.80x = 1,373.88 × 664.28
  4. Step 4: Simplify right side
    995.80x = 912,641.01
  5. Step 5: Solve for x
    x = 912,641.01/995.80
  6. Step 6: Final answer
    x = 916.49

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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.