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Finding the Fourth Proportional to 784.20, 1,174.50 and 622.02

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Solution

The fourth proportional to 784.20, 1,174.50 and 622.02 is: 931.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.20 : 1,174.50 = 622.02 : x
  2. Step 2: Convert to fraction form
    784.20/1,174.50 = 622.02/x
  3. Step 3: Cross multiply
    784.20x = 1,174.50 × 622.02
  4. Step 4: Simplify right side
    784.20x = 730,562.49
  5. Step 5: Solve for x
    x = 730,562.49/784.20
  6. Step 6: Final answer
    x = 931.60

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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.