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Finding the Fourth Proportional to 2,191.63, 3,287.94 and 631.64

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Solution

The fourth proportional to 2,191.63, 3,287.94 and 631.64 is: 947.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,191.63 : 3,287.94 = 631.64 : x
  2. Step 2: Convert to fraction form
    2,191.63/3,287.94 = 631.64/x
  3. Step 3: Cross multiply
    2,191.63x = 3,287.94 × 631.64
  4. Step 4: Simplify right side
    2,191.63x = 2,076,802.64
  5. Step 5: Solve for x
    x = 2,076,802.64/2,191.63
  6. Step 6: Final answer
    x = 947.61

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1.5x scale

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.