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Finding the Fourth Proportional to 210,485.66, 315,879.75 and 84,053.36

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Solution

The fourth proportional to 210,485.66, 315,879.75 and 84,053.36 is: 126,140.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,485.66 : 315,879.75 = 84,053.36 : x
  2. Step 2: Convert to fraction form
    210,485.66/315,879.75 = 84,053.36/x
  3. Step 3: Cross multiply
    210,485.66x = 315,879.75 × 84,053.36
  4. Step 4: Simplify right side
    210,485.66x = 26,550,755,133.16
  5. Step 5: Solve for x
    x = 26,550,755,133.16/210,485.66
  6. Step 6: Final answer
    x = 126,140.45

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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.