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Finding the Fourth Proportional to 228,640.73, 315,519.93 and 138,000.51

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Solution

The fourth proportional to 228,640.73, 315,519.93 and 138,000.51 is: 190,438.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    228,640.73 : 315,519.93 = 138,000.51 : x
  2. Step 2: Convert to fraction form
    228,640.73/315,519.93 = 138,000.51/x
  3. Step 3: Cross multiply
    228,640.73x = 315,519.93 × 138,000.51
  4. Step 4: Simplify right side
    228,640.73x = 43,541,911,643.29
  5. Step 5: Solve for x
    x = 43,541,911,643.29/228,640.73
  6. Step 6: Final answer
    x = 190,438.13

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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.