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Finding the Fourth Proportional to 1,019.01, 1,406.21 and 620.58

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Solution

The fourth proportional to 1,019.01, 1,406.21 and 620.58 is: 856.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.01 : 1,406.21 = 620.58 : x
  2. Step 2: Convert to fraction form
    1,019.01/1,406.21 = 620.58/x
  3. Step 3: Cross multiply
    1,019.01x = 1,406.21 × 620.58
  4. Step 4: Simplify right side
    1,019.01x = 872,660.32
  5. Step 5: Solve for x
    x = 872,660.32/1,019.01
  6. Step 6: Final answer
    x = 856.38

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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.