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Finding the Fourth Proportional to 855.45, 1,283.55 and 509.47

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Solution

The fourth proportional to 855.45, 1,283.55 and 509.47 is: 764.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.45 : 1,283.55 = 509.47 : x
  2. Step 2: Convert to fraction form
    855.45/1,283.55 = 509.47/x
  3. Step 3: Cross multiply
    855.45x = 1,283.55 × 509.47
  4. Step 4: Simplify right side
    855.45x = 653,930.22
  5. Step 5: Solve for x
    x = 653,930.22/855.45
  6. Step 6: Final answer
    x = 764.43

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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.