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Finding the Fourth Proportional to 388,316.78, 582,508.83 and 118,505.66

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Solution

The fourth proportional to 388,316.78, 582,508.83 and 118,505.66 is: 177,768.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,316.78 : 582,508.83 = 118,505.66 : x
  2. Step 2: Convert to fraction form
    388,316.78/582,508.83 = 118,505.66/x
  3. Step 3: Cross multiply
    388,316.78x = 582,508.83 × 118,505.66
  4. Step 4: Simplify right side
    388,316.78x = 69,030,595,835.65
  5. Step 5: Solve for x
    x = 69,030,595,835.65/388,316.78
  6. Step 6: Final answer
    x = 177,768.77

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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.