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Finding the Fourth Proportional to 1,172.70, 1,618.32 and 641.58

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Solution

The fourth proportional to 1,172.70, 1,618.32 and 641.58 is: 885.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.70 : 1,618.32 = 641.58 : x
  2. Step 2: Convert to fraction form
    1,172.70/1,618.32 = 641.58/x
  3. Step 3: Cross multiply
    1,172.70x = 1,618.32 × 641.58
  4. Step 4: Simplify right side
    1,172.70x = 1,038,281.75
  5. Step 5: Solve for x
    x = 1,038,281.75/1,172.70
  6. Step 6: Final answer
    x = 885.38

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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.