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Finding the Fourth Proportional to 1,120.71, 1,680.04 and 471.49

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Solution

The fourth proportional to 1,120.71, 1,680.04 and 471.49 is: 706.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.71 : 1,680.04 = 471.49 : x
  2. Step 2: Convert to fraction form
    1,120.71/1,680.04 = 471.49/x
  3. Step 3: Cross multiply
    1,120.71x = 1,680.04 × 471.49
  4. Step 4: Simplify right side
    1,120.71x = 792,122.06
  5. Step 5: Solve for x
    x = 792,122.06/1,120.71
  6. Step 6: Final answer
    x = 706.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.