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Finding the Fourth Proportional to 859.22, 1,287.98 and 448.40

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Solution

The fourth proportional to 859.22, 1,287.98 and 448.40 is: 672.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.22 : 1,287.98 = 448.40 : x
  2. Step 2: Convert to fraction form
    859.22/1,287.98 = 448.40/x
  3. Step 3: Cross multiply
    859.22x = 1,287.98 × 448.40
  4. Step 4: Simplify right side
    859.22x = 577,530.23
  5. Step 5: Solve for x
    x = 577,530.23/859.22
  6. Step 6: Final answer
    x = 672.16

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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.