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Finding the Fourth Proportional to 829.20, 1,244.70 and 521.40

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Solution

The fourth proportional to 829.20, 1,244.70 and 521.40 is: 782.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.20 : 1,244.70 = 521.40 : x
  2. Step 2: Convert to fraction form
    829.20/1,244.70 = 521.40/x
  3. Step 3: Cross multiply
    829.20x = 1,244.70 × 521.40
  4. Step 4: Simplify right side
    829.20x = 648,986.58
  5. Step 5: Solve for x
    x = 648,986.58/829.20
  6. Step 6: Final answer
    x = 782.67

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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.