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Finding the Fourth Proportional to 851.40, 1,277.85 and 504.30

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Solution

The fourth proportional to 851.40, 1,277.85 and 504.30 is: 756.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.40 : 1,277.85 = 504.30 : x
  2. Step 2: Convert to fraction form
    851.40/1,277.85 = 504.30/x
  3. Step 3: Cross multiply
    851.40x = 1,277.85 × 504.30
  4. Step 4: Simplify right side
    851.40x = 644,419.76
  5. Step 5: Solve for x
    x = 644,419.76/851.40
  6. Step 6: Final answer
    x = 756.89

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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.