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Finding the Fourth Proportional to 1,531.08, 2,112.12 and 940.68

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Solution

The fourth proportional to 1,531.08, 2,112.12 and 940.68 is: 1,297.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,531.08 : 2,112.12 = 940.68 : x
  2. Step 2: Convert to fraction form
    1,531.08/2,112.12 = 940.68/x
  3. Step 3: Cross multiply
    1,531.08x = 2,112.12 × 940.68
  4. Step 4: Simplify right side
    1,531.08x = 1,986,829.04
  5. Step 5: Solve for x
    x = 1,986,829.04/1,531.08
  6. Step 6: Final answer
    x = 1,297.67

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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.