Home / 1,285.20-1,926.72-636.66

Finding the Fourth Proportional to 1,285.20, 1,926.72 and 636.66

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Solution

The fourth proportional to 1,285.20, 1,926.72 and 636.66 is: 954.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.20 : 1,926.72 = 636.66 : x
  2. Step 2: Convert to fraction form
    1,285.20/1,926.72 = 636.66/x
  3. Step 3: Cross multiply
    1,285.20x = 1,926.72 × 636.66
  4. Step 4: Simplify right side
    1,285.20x = 1,226,665.56
  5. Step 5: Solve for x
    x = 1,226,665.56/1,285.20
  6. Step 6: Final answer
    x = 954.45

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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.