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Finding the Fourth Proportional to 995.38, 1,374.10 and 641.50

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Solution

The fourth proportional to 995.38, 1,374.10 and 641.50 is: 885.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.38 : 1,374.10 = 641.50 : x
  2. Step 2: Convert to fraction form
    995.38/1,374.10 = 641.50/x
  3. Step 3: Cross multiply
    995.38x = 1,374.10 × 641.50
  4. Step 4: Simplify right side
    995.38x = 881,485.15
  5. Step 5: Solve for x
    x = 881,485.15/995.38
  6. Step 6: Final answer
    x = 885.58

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1.5x scale

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.