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Finding the Fourth Proportional to 1,013.45, 1,398.86 and 620.39

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Solution

The fourth proportional to 1,013.45, 1,398.86 and 620.39 is: 856.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.45 : 1,398.86 = 620.39 : x
  2. Step 2: Convert to fraction form
    1,013.45/1,398.86 = 620.39/x
  3. Step 3: Cross multiply
    1,013.45x = 1,398.86 × 620.39
  4. Step 4: Simplify right side
    1,013.45x = 867,828.66
  5. Step 5: Solve for x
    x = 867,828.66/1,013.45
  6. Step 6: Final answer
    x = 856.32

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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.