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Finding the Fourth Proportional to 855.94, 1,281.59 and 444.21

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Solution

The fourth proportional to 855.94, 1,281.59 and 444.21 is: 665.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.94 : 1,281.59 = 444.21 : x
  2. Step 2: Convert to fraction form
    855.94/1,281.59 = 444.21/x
  3. Step 3: Cross multiply
    855.94x = 1,281.59 × 444.21
  4. Step 4: Simplify right side
    855.94x = 569,301.01
  5. Step 5: Solve for x
    x = 569,301.01/855.94
  6. Step 6: Final answer
    x = 665.12

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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.