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Finding the Fourth Proportional to 1,069.99, 1,605.84 and 485.03

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Solution

The fourth proportional to 1,069.99, 1,605.84 and 485.03 is: 727.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.99 : 1,605.84 = 485.03 : x
  2. Step 2: Convert to fraction form
    1,069.99/1,605.84 = 485.03/x
  3. Step 3: Cross multiply
    1,069.99x = 1,605.84 × 485.03
  4. Step 4: Simplify right side
    1,069.99x = 778,882.77
  5. Step 5: Solve for x
    x = 778,882.77/1,069.99
  6. Step 6: Final answer
    x = 727.94

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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.