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Finding the Fourth Proportional to 1,020.70, 1,529.70 and 904.60

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Solution

The fourth proportional to 1,020.70, 1,529.70 and 904.60 is: 1,355.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.70 : 1,529.70 = 904.60 : x
  2. Step 2: Convert to fraction form
    1,020.70/1,529.70 = 904.60/x
  3. Step 3: Cross multiply
    1,020.70x = 1,529.70 × 904.60
  4. Step 4: Simplify right side
    1,020.70x = 1,383,766.62
  5. Step 5: Solve for x
    x = 1,383,766.62/1,020.70
  6. Step 6: Final answer
    x = 1,355.70

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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.