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Finding the Fourth Proportional to 1,285.73, 1,927.69 and 659.49

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Solution

The fourth proportional to 1,285.73, 1,927.69 and 659.49 is: 988.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.73 : 1,927.69 = 659.49 : x
  2. Step 2: Convert to fraction form
    1,285.73/1,927.69 = 659.49/x
  3. Step 3: Cross multiply
    1,285.73x = 1,927.69 × 659.49
  4. Step 4: Simplify right side
    1,285.73x = 1,271,292.28
  5. Step 5: Solve for x
    x = 1,271,292.28/1,285.73
  6. Step 6: Final answer
    x = 988.77

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1.5x scale

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.