Home / 209,972.10-315,088.80-85,313.10

Finding the Fourth Proportional to 209,972.10, 315,088.80 and 85,313.10

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Solution

The fourth proportional to 209,972.10, 315,088.80 and 85,313.10 is: 128,022.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,972.10 : 315,088.80 = 85,313.10 : x
  2. Step 2: Convert to fraction form
    209,972.10/315,088.80 = 85,313.10/x
  3. Step 3: Cross multiply
    209,972.10x = 315,088.80 × 85,313.10
  4. Step 4: Simplify right side
    209,972.10x = 26,881,202,303.28
  5. Step 5: Solve for x
    x = 26,881,202,303.28/209,972.10
  6. Step 6: Final answer
    x = 128,022.73

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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.