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Finding the Fourth Proportional to 210,628.80, 315,943.20 and 92,174.40

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Solution

The fourth proportional to 210,628.80, 315,943.20 and 92,174.40 is: 138,261.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,628.80 : 315,943.20 = 92,174.40 : x
  2. Step 2: Convert to fraction form
    210,628.80/315,943.20 = 92,174.40/x
  3. Step 3: Cross multiply
    210,628.80x = 315,943.20 × 92,174.40
  4. Step 4: Simplify right side
    210,628.80x = 29,121,874,894.08
  5. Step 5: Solve for x
    x = 29,121,874,894.08/210,628.80
  6. Step 6: Final answer
    x = 138,261.60

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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.