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Finding the Fourth Proportional to 873.20, 1,310.34 and 386.66

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Solution

The fourth proportional to 873.20, 1,310.34 and 386.66 is: 580.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.20 : 1,310.34 = 386.66 : x
  2. Step 2: Convert to fraction form
    873.20/1,310.34 = 386.66/x
  3. Step 3: Cross multiply
    873.20x = 1,310.34 × 386.66
  4. Step 4: Simplify right side
    873.20x = 506,656.06
  5. Step 5: Solve for x
    x = 506,656.06/873.20
  6. Step 6: Final answer
    x = 580.23

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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.