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Finding the Fourth Proportional to 851.18, 1,277.16 and 389.10

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Solution

The fourth proportional to 851.18, 1,277.16 and 389.10 is: 583.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.18 : 1,277.16 = 389.10 : x
  2. Step 2: Convert to fraction form
    851.18/1,277.16 = 389.10/x
  3. Step 3: Cross multiply
    851.18x = 1,277.16 × 389.10
  4. Step 4: Simplify right side
    851.18x = 496,942.96
  5. Step 5: Solve for x
    x = 496,942.96/851.18
  6. Step 6: Final answer
    x = 583.83

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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.