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Finding the Fourth Proportional to 1,172.96, 1,618.67 and 641.85

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Solution

The fourth proportional to 1,172.96, 1,618.67 and 641.85 is: 885.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.96 : 1,618.67 = 641.85 : x
  2. Step 2: Convert to fraction form
    1,172.96/1,618.67 = 641.85/x
  3. Step 3: Cross multiply
    1,172.96x = 1,618.67 × 641.85
  4. Step 4: Simplify right side
    1,172.96x = 1,038,943.34
  5. Step 5: Solve for x
    x = 1,038,943.34/1,172.96
  6. Step 6: Final answer
    x = 885.74

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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.