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Finding the Fourth Proportional to 878.51, 1,316.49 and 445.07

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Solution

The fourth proportional to 878.51, 1,316.49 and 445.07 is: 666.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.51 : 1,316.49 = 445.07 : x
  2. Step 2: Convert to fraction form
    878.51/1,316.49 = 445.07/x
  3. Step 3: Cross multiply
    878.51x = 1,316.49 × 445.07
  4. Step 4: Simplify right side
    878.51x = 585,930.20
  5. Step 5: Solve for x
    x = 585,930.20/878.51
  6. Step 6: Final answer
    x = 666.96

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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.