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Finding the Fourth Proportional to 228,639.84, 315,539.60 and 138,017.88

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Solution

The fourth proportional to 228,639.84, 315,539.60 and 138,017.88 is: 190,474.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    228,639.84 : 315,539.60 = 138,017.88 : x
  2. Step 2: Convert to fraction form
    228,639.84/315,539.60 = 138,017.88/x
  3. Step 3: Cross multiply
    228,639.84x = 315,539.60 × 138,017.88
  4. Step 4: Simplify right side
    228,639.84x = 43,550,106,648.05
  5. Step 5: Solve for x
    x = 43,550,106,648.05/228,639.84
  6. Step 6: Final answer
    x = 190,474.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.