Home / 209,971.10-315,087.30-85,312.10

Finding the Fourth Proportional to 209,971.10, 315,087.30 and 85,312.10

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Solution

The fourth proportional to 209,971.10, 315,087.30 and 85,312.10 is: 128,021.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,971.10 : 315,087.30 = 85,312.10 : x
  2. Step 2: Convert to fraction form
    209,971.10/315,087.30 = 85,312.10/x
  3. Step 3: Cross multiply
    209,971.10x = 315,087.30 × 85,312.10
  4. Step 4: Simplify right side
    209,971.10x = 26,880,760,034.05
  5. Step 5: Solve for x
    x = 26,880,760,034.05/209,971.10
  6. Step 6: Final answer
    x = 128,021.24

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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.