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Finding the Fourth Proportional to 1,283.51, 1,920.11 and 1,112.13

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Solution

The fourth proportional to 1,283.51, 1,920.11 and 1,112.13 is: 1,663.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,283.51 : 1,920.11 = 1,112.13 : x
  2. Step 2: Convert to fraction form
    1,283.51/1,920.11 = 1,112.13/x
  3. Step 3: Cross multiply
    1,283.51x = 1,920.11 × 1,112.13
  4. Step 4: Simplify right side
    1,283.51x = 2,135,406.37
  5. Step 5: Solve for x
    x = 2,135,406.37/1,283.51
  6. Step 6: Final answer
    x = 1,663.72

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1.5x scale

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.