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Finding the Fourth Proportional to 1,445.57, 1,994.87 and 782.42

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Solution

The fourth proportional to 1,445.57, 1,994.87 and 782.42 is: 1,079.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,445.57 : 1,994.87 = 782.42 : x
  2. Step 2: Convert to fraction form
    1,445.57/1,994.87 = 782.42/x
  3. Step 3: Cross multiply
    1,445.57x = 1,994.87 × 782.42
  4. Step 4: Simplify right side
    1,445.57x = 1,560,816.21
  5. Step 5: Solve for x
    x = 1,560,816.21/1,445.57
  6. Step 6: Final answer
    x = 1,079.73

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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.