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Finding the Fourth Proportional to 315,939.42, 474,040.98 and 138,573.72

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Solution

The fourth proportional to 315,939.42, 474,040.98 and 138,573.72 is: 207,918.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,939.42 : 474,040.98 = 138,573.72 : x
  2. Step 2: Convert to fraction form
    315,939.42/474,040.98 = 138,573.72/x
  3. Step 3: Cross multiply
    315,939.42x = 474,040.98 × 138,573.72
  4. Step 4: Simplify right side
    315,939.42x = 65,689,622,031.05
  5. Step 5: Solve for x
    x = 65,689,622,031.05/315,939.42
  6. Step 6: Final answer
    x = 207,918.41

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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.