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Finding the Fourth Proportional to 210,427.20, 315,640.80 and 105,208.20

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Solution

The fourth proportional to 210,427.20, 315,640.80 and 105,208.20 is: 157,812.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,427.20 : 315,640.80 = 105,208.20 : x
  2. Step 2: Convert to fraction form
    210,427.20/315,640.80 = 105,208.20/x
  3. Step 3: Cross multiply
    210,427.20x = 315,640.80 × 105,208.20
  4. Step 4: Simplify right side
    210,427.20x = 33,208,000,414.56
  5. Step 5: Solve for x
    x = 33,208,000,414.56/210,427.20
  6. Step 6: Final answer
    x = 157,812.30

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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.