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Finding the Fourth Proportional to 1,172.56, 1,618.50 and 752.98

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Solution

The fourth proportional to 1,172.56, 1,618.50 and 752.98 is: 1,039.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.56 : 1,618.50 = 752.98 : x
  2. Step 2: Convert to fraction form
    1,172.56/1,618.50 = 752.98/x
  3. Step 3: Cross multiply
    1,172.56x = 1,618.50 × 752.98
  4. Step 4: Simplify right side
    1,172.56x = 1,218,698.13
  5. Step 5: Solve for x
    x = 1,218,698.13/1,172.56
  6. Step 6: Final answer
    x = 1,039.35

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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.