Home / 207,490.51-311,314.20-81,221.00

Finding the Fourth Proportional to 207,490.51, 311,314.20 and 81,221.00

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Solution

The fourth proportional to 207,490.51, 311,314.20 and 81,221.00 is: 121,862.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,490.51 : 311,314.20 = 81,221.00 : x
  2. Step 2: Convert to fraction form
    207,490.51/311,314.20 = 81,221.00/x
  3. Step 3: Cross multiply
    207,490.51x = 311,314.20 × 81,221.00
  4. Step 4: Simplify right side
    207,490.51x = 25,285,249,081.63
  5. Step 5: Solve for x
    x = 25,285,249,081.63/207,490.51
  6. Step 6: Final answer
    x = 121,862.20

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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.