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Finding the Fourth Proportional to 1,069.73, 1,605.59 and 659.66

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Solution

The fourth proportional to 1,069.73, 1,605.59 and 659.66 is: 990.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.73 : 1,605.59 = 659.66 : x
  2. Step 2: Convert to fraction form
    1,069.73/1,605.59 = 659.66/x
  3. Step 3: Cross multiply
    1,069.73x = 1,605.59 × 659.66
  4. Step 4: Simplify right side
    1,069.73x = 1,059,132.17
  5. Step 5: Solve for x
    x = 1,059,132.17/1,069.73
  6. Step 6: Final answer
    x = 990.10

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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.