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Finding the Fourth Proportional to 1,242.20, 1,861.21 and 875.21

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Solution

The fourth proportional to 1,242.20, 1,861.21 and 875.21 is: 1,311.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.20 : 1,861.21 = 875.21 : x
  2. Step 2: Convert to fraction form
    1,242.20/1,861.21 = 875.21/x
  3. Step 3: Cross multiply
    1,242.20x = 1,861.21 × 875.21
  4. Step 4: Simplify right side
    1,242.20x = 1,628,941.39
  5. Step 5: Solve for x
    x = 1,628,941.39/1,242.20
  6. Step 6: Final answer
    x = 1,311.33

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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.