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Finding the Fourth Proportional to 1,441.88, 1,989.80 and 820.88

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Solution

The fourth proportional to 1,441.88, 1,989.80 and 820.88 is: 1,132.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,441.88 : 1,989.80 = 820.88 : x
  2. Step 2: Convert to fraction form
    1,441.88/1,989.80 = 820.88/x
  3. Step 3: Cross multiply
    1,441.88x = 1,989.80 × 820.88
  4. Step 4: Simplify right side
    1,441.88x = 1,633,387.02
  5. Step 5: Solve for x
    x = 1,633,387.02/1,441.88
  6. Step 6: Final answer
    x = 1,132.82

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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.