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Finding the Fourth Proportional to 858.85, 1,288.96 and 448.34

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Solution

The fourth proportional to 858.85, 1,288.96 and 448.34 is: 672.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.85 : 1,288.96 = 448.34 : x
  2. Step 2: Convert to fraction form
    858.85/1,288.96 = 448.34/x
  3. Step 3: Cross multiply
    858.85x = 1,288.96 × 448.34
  4. Step 4: Simplify right side
    858.85x = 577,887.28
  5. Step 5: Solve for x
    x = 577,887.28/858.85
  6. Step 6: Final answer
    x = 672.86

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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.