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Finding the Fourth Proportional to 1,190.51, 1,642.86 and 666.53

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Solution

The fourth proportional to 1,190.51, 1,642.86 and 666.53 is: 919.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.51 : 1,642.86 = 666.53 : x
  2. Step 2: Convert to fraction form
    1,190.51/1,642.86 = 666.53/x
  3. Step 3: Cross multiply
    1,190.51x = 1,642.86 × 666.53
  4. Step 4: Simplify right side
    1,190.51x = 1,095,019.58
  5. Step 5: Solve for x
    x = 1,095,019.58/1,190.51
  6. Step 6: Final answer
    x = 919.79

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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.