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Finding the Fourth Proportional to 1,178.12, 1,627.89 and 847.64

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Solution

The fourth proportional to 1,178.12, 1,627.89 and 847.64 is: 1,171.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.12 : 1,627.89 = 847.64 : x
  2. Step 2: Convert to fraction form
    1,178.12/1,627.89 = 847.64/x
  3. Step 3: Cross multiply
    1,178.12x = 1,627.89 × 847.64
  4. Step 4: Simplify right side
    1,178.12x = 1,379,864.68
  5. Step 5: Solve for x
    x = 1,379,864.68/1,178.12
  6. Step 6: Final answer
    x = 1,171.24

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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.