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Finding the Fourth Proportional to 1,285.73, 1,929.30 and 700.70

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Solution

The fourth proportional to 1,285.73, 1,929.30 and 700.70 is: 1,051.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.73 : 1,929.30 = 700.70 : x
  2. Step 2: Convert to fraction form
    1,285.73/1,929.30 = 700.70/x
  3. Step 3: Cross multiply
    1,285.73x = 1,929.30 × 700.70
  4. Step 4: Simplify right side
    1,285.73x = 1,351,860.51
  5. Step 5: Solve for x
    x = 1,351,860.51/1,285.73
  6. Step 6: Final answer
    x = 1,051.43

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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.