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Finding the Fourth Proportional to 1,407.56, 2,112.30 and 638.60

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Solution

The fourth proportional to 1,407.56, 2,112.30 and 638.60 is: 958.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.56 : 2,112.30 = 638.60 : x
  2. Step 2: Convert to fraction form
    1,407.56/2,112.30 = 638.60/x
  3. Step 3: Cross multiply
    1,407.56x = 2,112.30 × 638.60
  4. Step 4: Simplify right side
    1,407.56x = 1,348,914.78
  5. Step 5: Solve for x
    x = 1,348,914.78/1,407.56
  6. Step 6: Final answer
    x = 958.34

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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.