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Finding the Fourth Proportional to 955.05, 1,430.72 and 851.85

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Solution

The fourth proportional to 955.05, 1,430.72 and 851.85 is: 1,276.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.05 : 1,430.72 = 851.85 : x
  2. Step 2: Convert to fraction form
    955.05/1,430.72 = 851.85/x
  3. Step 3: Cross multiply
    955.05x = 1,430.72 × 851.85
  4. Step 4: Simplify right side
    955.05x = 1,218,754.57
  5. Step 5: Solve for x
    x = 1,218,754.57/955.05
  6. Step 6: Final answer
    x = 1,276.12

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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.