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Finding the Fourth Proportional to 1,190.37, 1,642.67 and 666.39

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Solution

The fourth proportional to 1,190.37, 1,642.67 and 666.39 is: 919.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.37 : 1,642.67 = 666.39 : x
  2. Step 2: Convert to fraction form
    1,190.37/1,642.67 = 666.39/x
  3. Step 3: Cross multiply
    1,190.37x = 1,642.67 × 666.39
  4. Step 4: Simplify right side
    1,190.37x = 1,094,655.53
  5. Step 5: Solve for x
    x = 1,094,655.53/1,190.37
  6. Step 6: Final answer
    x = 919.59

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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.