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Finding the Fourth Proportional to 1,445.70, 1,995.05 and 782.54

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Solution

The fourth proportional to 1,445.70, 1,995.05 and 782.54 is: 1,079.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,445.70 : 1,995.05 = 782.54 : x
  2. Step 2: Convert to fraction form
    1,445.70/1,995.05 = 782.54/x
  3. Step 3: Cross multiply
    1,445.70x = 1,995.05 × 782.54
  4. Step 4: Simplify right side
    1,445.70x = 1,561,206.43
  5. Step 5: Solve for x
    x = 1,561,206.43/1,445.70
  6. Step 6: Final answer
    x = 1,079.90

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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.