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Finding the Fourth Proportional to 1,073.40, 1,611.70 and 830.20

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Solution

The fourth proportional to 1,073.40, 1,611.70 and 830.20 is: 1,246.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,073.40 : 1,611.70 = 830.20 : x
  2. Step 2: Convert to fraction form
    1,073.40/1,611.70 = 830.20/x
  3. Step 3: Cross multiply
    1,073.40x = 1,611.70 × 830.20
  4. Step 4: Simplify right side
    1,073.40x = 1,338,033.34
  5. Step 5: Solve for x
    x = 1,338,033.34/1,073.40
  6. Step 6: Final answer
    x = 1,246.54

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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.