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Finding the Fourth Proportional to 856.49, 1,284.93 and 445.59

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Solution

The fourth proportional to 856.49, 1,284.93 and 445.59 is: 668.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.49 : 1,284.93 = 445.59 : x
  2. Step 2: Convert to fraction form
    856.49/1,284.93 = 445.59/x
  3. Step 3: Cross multiply
    856.49x = 1,284.93 × 445.59
  4. Step 4: Simplify right side
    856.49x = 572,551.96
  5. Step 5: Solve for x
    x = 572,551.96/856.49
  6. Step 6: Final answer
    x = 668.49

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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.