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Finding the Fourth Proportional to 1,447.06, 2,170.50 and 421.06

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Solution

The fourth proportional to 1,447.06, 2,170.50 and 421.06 is: 631.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,447.06 : 2,170.50 = 421.06 : x
  2. Step 2: Convert to fraction form
    1,447.06/2,170.50 = 421.06/x
  3. Step 3: Cross multiply
    1,447.06x = 2,170.50 × 421.06
  4. Step 4: Simplify right side
    1,447.06x = 913,910.73
  5. Step 5: Solve for x
    x = 913,910.73/1,447.06
  6. Step 6: Final answer
    x = 631.56

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1.5x scale

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.