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Finding the Fourth Proportional to 1,161.12, 1,743.20 and 693.45

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Solution

The fourth proportional to 1,161.12, 1,743.20 and 693.45 is: 1,041.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161.12 : 1,743.20 = 693.45 : x
  2. Step 2: Convert to fraction form
    1,161.12/1,743.20 = 693.45/x
  3. Step 3: Cross multiply
    1,161.12x = 1,743.20 × 693.45
  4. Step 4: Simplify right side
    1,161.12x = 1,208,822.04
  5. Step 5: Solve for x
    x = 1,208,822.04/1,161.12
  6. Step 6: Final answer
    x = 1,041.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.