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Finding the Fourth Proportional to 851.48, 1,277.81 and 389.31

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Solution

The fourth proportional to 851.48, 1,277.81 and 389.31 is: 584.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.48 : 1,277.81 = 389.31 : x
  2. Step 2: Convert to fraction form
    851.48/1,277.81 = 389.31/x
  3. Step 3: Cross multiply
    851.48x = 1,277.81 × 389.31
  4. Step 4: Simplify right side
    851.48x = 497,462.26
  5. Step 5: Solve for x
    x = 497,462.26/851.48
  6. Step 6: Final answer
    x = 584.24

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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.