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Finding the Fourth Proportional to 1,013.27, 1,398.48 and 620.51

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Solution

The fourth proportional to 1,013.27, 1,398.48 and 620.51 is: 856.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.27 : 1,398.48 = 620.51 : x
  2. Step 2: Convert to fraction form
    1,013.27/1,398.48 = 620.51/x
  3. Step 3: Cross multiply
    1,013.27x = 1,398.48 × 620.51
  4. Step 4: Simplify right side
    1,013.27x = 867,770.82
  5. Step 5: Solve for x
    x = 867,770.82/1,013.27
  6. Step 6: Final answer
    x = 856.41

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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.