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Finding the Fourth Proportional to 1,172.76, 1,619.13 and 818.52

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Solution

The fourth proportional to 1,172.76, 1,619.13 and 818.52 is: 1,130.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.76 : 1,619.13 = 818.52 : x
  2. Step 2: Convert to fraction form
    1,172.76/1,619.13 = 818.52/x
  3. Step 3: Cross multiply
    1,172.76x = 1,619.13 × 818.52
  4. Step 4: Simplify right side
    1,172.76x = 1,325,290.29
  5. Step 5: Solve for x
    x = 1,325,290.29/1,172.76
  6. Step 6: Final answer
    x = 1,130.06

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1.5x scale

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.