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Finding the Fourth Proportional to 873.01, 1,309.94 and 385.48

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Solution

The fourth proportional to 873.01, 1,309.94 and 385.48 is: 578.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.01 : 1,309.94 = 385.48 : x
  2. Step 2: Convert to fraction form
    873.01/1,309.94 = 385.48/x
  3. Step 3: Cross multiply
    873.01x = 1,309.94 × 385.48
  4. Step 4: Simplify right side
    873.01x = 504,955.67
  5. Step 5: Solve for x
    x = 504,955.67/873.01
  6. Step 6: Final answer
    x = 578.41

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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.