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Finding the Fourth Proportional to 1,332.60, 1,991.12 and 1,172.22

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Solution

The fourth proportional to 1,332.60, 1,991.12 and 1,172.22 is: 1,751.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,332.60 : 1,991.12 = 1,172.22 : x
  2. Step 2: Convert to fraction form
    1,332.60/1,991.12 = 1,172.22/x
  3. Step 3: Cross multiply
    1,332.60x = 1,991.12 × 1,172.22
  4. Step 4: Simplify right side
    1,332.60x = 2,334,030.69
  5. Step 5: Solve for x
    x = 2,334,030.69/1,332.60
  6. Step 6: Final answer
    x = 1,751.49

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.