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Finding the Fourth Proportional to 388,278.19, 582,683.28 and 135,558.71

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Solution

The fourth proportional to 388,278.19, 582,683.28 and 135,558.71 is: 203,430.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,278.19 : 582,683.28 = 135,558.71 : x
  2. Step 2: Convert to fraction form
    388,278.19/582,683.28 = 135,558.71/x
  3. Step 3: Cross multiply
    388,278.19x = 582,683.28 × 135,558.71
  4. Step 4: Simplify right side
    388,278.19x = 78,987,793,775.37
  5. Step 5: Solve for x
    x = 78,987,793,775.37/388,278.19
  6. Step 6: Final answer
    x = 203,430.93

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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.