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Finding the Fourth Proportional to 1,197.45, 1,652.40 and 666.39

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Solution

The fourth proportional to 1,197.45, 1,652.40 and 666.39 is: 919.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,197.45 : 1,652.40 = 666.39 : x
  2. Step 2: Convert to fraction form
    1,197.45/1,652.40 = 666.39/x
  3. Step 3: Cross multiply
    1,197.45x = 1,652.40 × 666.39
  4. Step 4: Simplify right side
    1,197.45x = 1,101,142.84
  5. Step 5: Solve for x
    x = 1,101,142.84/1,197.45
  6. Step 6: Final answer
    x = 919.57

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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.