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Finding the Fourth Proportional to 1,172.50, 1,618.10 and 648.53

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Solution

The fourth proportional to 1,172.50, 1,618.10 and 648.53 is: 895.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.50 : 1,618.10 = 648.53 : x
  2. Step 2: Convert to fraction form
    1,172.50/1,618.10 = 648.53/x
  3. Step 3: Cross multiply
    1,172.50x = 1,618.10 × 648.53
  4. Step 4: Simplify right side
    1,172.50x = 1,049,390.44
  5. Step 5: Solve for x
    x = 1,049,390.44/1,172.50
  6. Step 6: Final answer
    x = 895.00

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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.