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Finding the Fourth Proportional to 896.80, 1,342.80 and 570.40

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Solution

The fourth proportional to 896.80, 1,342.80 and 570.40 is: 854.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.80 : 1,342.80 = 570.40 : x
  2. Step 2: Convert to fraction form
    896.80/1,342.80 = 570.40/x
  3. Step 3: Cross multiply
    896.80x = 1,342.80 × 570.40
  4. Step 4: Simplify right side
    896.80x = 765,933.12
  5. Step 5: Solve for x
    x = 765,933.12/896.80
  6. Step 6: Final answer
    x = 854.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.