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Finding the Fourth Proportional to 784.65, 1,179.59 and 555.19

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Solution

The fourth proportional to 784.65, 1,179.59 and 555.19 is: 834.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.65 : 1,179.59 = 555.19 : x
  2. Step 2: Convert to fraction form
    784.65/1,179.59 = 555.19/x
  3. Step 3: Cross multiply
    784.65x = 1,179.59 × 555.19
  4. Step 4: Simplify right side
    784.65x = 654,896.57
  5. Step 5: Solve for x
    x = 654,896.57/784.65
  6. Step 6: Final answer
    x = 834.64

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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.