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Finding the Fourth Proportional to 1,128.99, 1,693.62 and 388.73

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Solution

The fourth proportional to 1,128.99, 1,693.62 and 388.73 is: 583.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.99 : 1,693.62 = 388.73 : x
  2. Step 2: Convert to fraction form
    1,128.99/1,693.62 = 388.73/x
  3. Step 3: Cross multiply
    1,128.99x = 1,693.62 × 388.73
  4. Step 4: Simplify right side
    1,128.99x = 658,352.43
  5. Step 5: Solve for x
    x = 658,352.43/1,128.99
  6. Step 6: Final answer
    x = 583.13

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Half scale
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Double scale
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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.