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Finding the Fourth Proportional to 210,640.20, 315,960.30 and 105,421.20

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Solution

The fourth proportional to 210,640.20, 315,960.30 and 105,421.20 is: 158,131.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,640.20 : 315,960.30 = 105,421.20 : x
  2. Step 2: Convert to fraction form
    210,640.20/315,960.30 = 105,421.20/x
  3. Step 3: Cross multiply
    210,640.20x = 315,960.30 × 105,421.20
  4. Step 4: Simplify right side
    210,640.20x = 33,308,913,978.36
  5. Step 5: Solve for x
    x = 33,308,913,978.36/210,640.20
  6. Step 6: Final answer
    x = 158,131.80

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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.