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Finding the Fourth Proportional to 1,247.94, 1,870.11 and 631.26

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Solution

The fourth proportional to 1,247.94, 1,870.11 and 631.26 is: 945.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.94 : 1,870.11 = 631.26 : x
  2. Step 2: Convert to fraction form
    1,247.94/1,870.11 = 631.26/x
  3. Step 3: Cross multiply
    1,247.94x = 1,870.11 × 631.26
  4. Step 4: Simplify right side
    1,247.94x = 1,180,525.64
  5. Step 5: Solve for x
    x = 1,180,525.64/1,247.94
  6. Step 6: Final answer
    x = 945.98

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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.