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Finding the Fourth Proportional to 995.64, 1,374.21 and 645.72

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Solution

The fourth proportional to 995.64, 1,374.21 and 645.72 is: 891.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.64 : 1,374.21 = 645.72 : x
  2. Step 2: Convert to fraction form
    995.64/1,374.21 = 645.72/x
  3. Step 3: Cross multiply
    995.64x = 1,374.21 × 645.72
  4. Step 4: Simplify right side
    995.64x = 887,354.88
  5. Step 5: Solve for x
    x = 887,354.88/995.64
  6. Step 6: Final answer
    x = 891.24

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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.