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Finding the Fourth Proportional to 784.72, 1,174.50 and 579.19

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Solution

The fourth proportional to 784.72, 1,174.50 and 579.19 is: 866.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.72 : 1,174.50 = 579.19 : x
  2. Step 2: Convert to fraction form
    784.72/1,174.50 = 579.19/x
  3. Step 3: Cross multiply
    784.72x = 1,174.50 × 579.19
  4. Step 4: Simplify right side
    784.72x = 680,258.66
  5. Step 5: Solve for x
    x = 680,258.66/784.72
  6. Step 6: Final answer
    x = 866.88

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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.