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Finding the Fourth Proportional to 1,172.80, 1,618.45 and 648.84

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Solution

The fourth proportional to 1,172.80, 1,618.45 and 648.84 is: 895.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.80 : 1,618.45 = 648.84 : x
  2. Step 2: Convert to fraction form
    1,172.80/1,618.45 = 648.84/x
  3. Step 3: Cross multiply
    1,172.80x = 1,618.45 × 648.84
  4. Step 4: Simplify right side
    1,172.80x = 1,050,115.10
  5. Step 5: Solve for x
    x = 1,050,115.10/1,172.80
  6. Step 6: Final answer
    x = 895.39

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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.