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Finding the Fourth Proportional to 1,247.75, 1,870.64 and 622.63

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Solution

The fourth proportional to 1,247.75, 1,870.64 and 622.63 is: 933.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.75 : 1,870.64 = 622.63 : x
  2. Step 2: Convert to fraction form
    1,247.75/1,870.64 = 622.63/x
  3. Step 3: Cross multiply
    1,247.75x = 1,870.64 × 622.63
  4. Step 4: Simplify right side
    1,247.75x = 1,164,720.33
  5. Step 5: Solve for x
    x = 1,164,720.33/1,247.75
  6. Step 6: Final answer
    x = 933.46

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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.