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Finding the Fourth Proportional to 1,620.88, 2,237.88 and 1,247.16

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Solution

The fourth proportional to 1,620.88, 2,237.88 and 1,247.16 is: 1,721.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.88 : 2,237.88 = 1,247.16 : x
  2. Step 2: Convert to fraction form
    1,620.88/2,237.88 = 1,247.16/x
  3. Step 3: Cross multiply
    1,620.88x = 2,237.88 × 1,247.16
  4. Step 4: Simplify right side
    1,620.88x = 2,790,994.42
  5. Step 5: Solve for x
    x = 2,790,994.42/1,620.88
  6. Step 6: Final answer
    x = 1,721.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.