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Finding the Fourth Proportional to 856.15, 1,284.24 and 445.03

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Solution

The fourth proportional to 856.15, 1,284.24 and 445.03 is: 667.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.15 : 1,284.24 = 445.03 : x
  2. Step 2: Convert to fraction form
    856.15/1,284.24 = 445.03/x
  3. Step 3: Cross multiply
    856.15x = 1,284.24 × 445.03
  4. Step 4: Simplify right side
    856.15x = 571,525.33
  5. Step 5: Solve for x
    x = 571,525.33/856.15
  6. Step 6: Final answer
    x = 667.55

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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.