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Finding the Fourth Proportional to 1,170.78, 1,615.61 and 666.57

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Solution

The fourth proportional to 1,170.78, 1,615.61 and 666.57 is: 919.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.78 : 1,615.61 = 666.57 : x
  2. Step 2: Convert to fraction form
    1,170.78/1,615.61 = 666.57/x
  3. Step 3: Cross multiply
    1,170.78x = 1,615.61 × 666.57
  4. Step 4: Simplify right side
    1,170.78x = 1,076,917.16
  5. Step 5: Solve for x
    x = 1,076,917.16/1,170.78
  6. Step 6: Final answer
    x = 919.83

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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.