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Finding the Fourth Proportional to 1,172.85, 1,618.53 and 648.90

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Solution

The fourth proportional to 1,172.85, 1,618.53 and 648.90 is: 895.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.85 : 1,618.53 = 648.90 : x
  2. Step 2: Convert to fraction form
    1,172.85/1,618.53 = 648.90/x
  3. Step 3: Cross multiply
    1,172.85x = 1,618.53 × 648.90
  4. Step 4: Simplify right side
    1,172.85x = 1,050,264.12
  5. Step 5: Solve for x
    x = 1,050,264.12/1,172.85
  6. Step 6: Final answer
    x = 895.48

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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.