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Finding the Fourth Proportional to 851.55, 1,276.51 and 642.99

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Solution

The fourth proportional to 851.55, 1,276.51 and 642.99 is: 963.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.55 : 1,276.51 = 642.99 : x
  2. Step 2: Convert to fraction form
    851.55/1,276.51 = 642.99/x
  3. Step 3: Cross multiply
    851.55x = 1,276.51 × 642.99
  4. Step 4: Simplify right side
    851.55x = 820,783.16
  5. Step 5: Solve for x
    x = 820,783.16/851.55
  6. Step 6: Final answer
    x = 963.87

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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.