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Finding the Fourth Proportional to 1,247.80, 1,871.70 and 881.50

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Solution

The fourth proportional to 1,247.80, 1,871.70 and 881.50 is: 1,322.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.80 : 1,871.70 = 881.50 : x
  2. Step 2: Convert to fraction form
    1,247.80/1,871.70 = 881.50/x
  3. Step 3: Cross multiply
    1,247.80x = 1,871.70 × 881.50
  4. Step 4: Simplify right side
    1,247.80x = 1,649,903.55
  5. Step 5: Solve for x
    x = 1,649,903.55/1,247.80
  6. Step 6: Final answer
    x = 1,322.25

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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.