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Finding the Fourth Proportional to 1,190.91, 1,643.32 and 693.45

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Solution

The fourth proportional to 1,190.91, 1,643.32 and 693.45 is: 956.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.91 : 1,643.32 = 693.45 : x
  2. Step 2: Convert to fraction form
    1,190.91/1,643.32 = 693.45/x
  3. Step 3: Cross multiply
    1,190.91x = 1,643.32 × 693.45
  4. Step 4: Simplify right side
    1,190.91x = 1,139,560.25
  5. Step 5: Solve for x
    x = 1,139,560.25/1,190.91
  6. Step 6: Final answer
    x = 956.88

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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.