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Finding the Fourth Proportional to 1,283.85, 1,924.55 and 820.32

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Solution

The fourth proportional to 1,283.85, 1,924.55 and 820.32 is: 1,229.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,283.85 : 1,924.55 = 820.32 : x
  2. Step 2: Convert to fraction form
    1,283.85/1,924.55 = 820.32/x
  3. Step 3: Cross multiply
    1,283.85x = 1,924.55 × 820.32
  4. Step 4: Simplify right side
    1,283.85x = 1,578,742.75
  5. Step 5: Solve for x
    x = 1,578,742.75/1,283.85
  6. Step 6: Final answer
    x = 1,229.69

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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.