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Finding the Fourth Proportional to 1,173.96, 1,620.05 and 642.85

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Solution

The fourth proportional to 1,173.96, 1,620.05 and 642.85 is: 887.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,173.96 : 1,620.05 = 642.85 : x
  2. Step 2: Convert to fraction form
    1,173.96/1,620.05 = 642.85/x
  3. Step 3: Cross multiply
    1,173.96x = 1,620.05 × 642.85
  4. Step 4: Simplify right side
    1,173.96x = 1,041,446.70
  5. Step 5: Solve for x
    x = 1,041,446.70/1,173.96
  6. Step 6: Final answer
    x = 887.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.