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Finding the Fourth Proportional to 3,112.71, 4,670.07 and 921.48

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Solution

The fourth proportional to 3,112.71, 4,670.07 and 921.48 is: 1,382.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,112.71 : 4,670.07 = 921.48 : x
  2. Step 2: Convert to fraction form
    3,112.71/4,670.07 = 921.48/x
  3. Step 3: Cross multiply
    3,112.71x = 4,670.07 × 921.48
  4. Step 4: Simplify right side
    3,112.71x = 4,303,376.10
  5. Step 5: Solve for x
    x = 4,303,376.10/3,112.71
  6. Step 6: Final answer
    x = 1,382.52

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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.