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Finding the Fourth Proportional to 1,019.28, 1,406.70 and 577.20

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Solution

The fourth proportional to 1,019.28, 1,406.70 and 577.20 is: 796.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.28 : 1,406.70 = 577.20 : x
  2. Step 2: Convert to fraction form
    1,019.28/1,406.70 = 577.20/x
  3. Step 3: Cross multiply
    1,019.28x = 1,406.70 × 577.20
  4. Step 4: Simplify right side
    1,019.28x = 811,947.24
  5. Step 5: Solve for x
    x = 811,947.24/1,019.28
  6. Step 6: Final answer
    x = 796.59

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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.