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Finding the Fourth Proportional to 873.11, 1,308.96 and 386.03

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Solution

The fourth proportional to 873.11, 1,308.96 and 386.03 is: 578.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.11 : 1,308.96 = 386.03 : x
  2. Step 2: Convert to fraction form
    873.11/1,308.96 = 386.03/x
  3. Step 3: Cross multiply
    873.11x = 1,308.96 × 386.03
  4. Step 4: Simplify right side
    873.11x = 505,301.10
  5. Step 5: Solve for x
    x = 505,301.10/873.11
  6. Step 6: Final answer
    x = 578.74

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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.