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Finding the Fourth Proportional to 1,247.79, 1,871.58 and 663.11

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Solution

The fourth proportional to 1,247.79, 1,871.58 and 663.11 is: 994.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.79 : 1,871.58 = 663.11 : x
  2. Step 2: Convert to fraction form
    1,247.79/1,871.58 = 663.11/x
  3. Step 3: Cross multiply
    1,247.79x = 1,871.58 × 663.11
  4. Step 4: Simplify right side
    1,247.79x = 1,241,054.06
  5. Step 5: Solve for x
    x = 1,241,054.06/1,247.79
  6. Step 6: Final answer
    x = 994.60

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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.