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Finding the Fourth Proportional to 210,004.80, 315,007.20 and 135,209.40

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Solution

The fourth proportional to 210,004.80, 315,007.20 and 135,209.40 is: 202,814.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,004.80 : 315,007.20 = 135,209.40 : x
  2. Step 2: Convert to fraction form
    210,004.80/315,007.20 = 135,209.40/x
  3. Step 3: Cross multiply
    210,004.80x = 315,007.20 × 135,209.40
  4. Step 4: Simplify right side
    210,004.80x = 42,591,934,507.68
  5. Step 5: Solve for x
    x = 42,591,934,507.68/210,004.80
  6. Step 6: Final answer
    x = 202,814.10

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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.