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Finding the Fourth Proportional to 1,019.73, 1,407.21 and 571.60

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Solution

The fourth proportional to 1,019.73, 1,407.21 and 571.60 is: 788.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.73 : 1,407.21 = 571.60 : x
  2. Step 2: Convert to fraction form
    1,019.73/1,407.21 = 571.60/x
  3. Step 3: Cross multiply
    1,019.73x = 1,407.21 × 571.60
  4. Step 4: Simplify right side
    1,019.73x = 804,351.34
  5. Step 5: Solve for x
    x = 804,351.34/1,019.73
  6. Step 6: Final answer
    x = 788.79

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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.