Home / 209,968.12-315,083.40-85,309.12

Finding the Fourth Proportional to 209,968.12, 315,083.40 and 85,309.12

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Solution

The fourth proportional to 209,968.12, 315,083.40 and 85,309.12 is: 128,016.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,968.12 : 315,083.40 = 85,309.12 : x
  2. Step 2: Convert to fraction form
    209,968.12/315,083.40 = 85,309.12/x
  3. Step 3: Cross multiply
    209,968.12x = 315,083.40 × 85,309.12
  4. Step 4: Simplify right side
    209,968.12x = 26,879,487,580.61
  5. Step 5: Solve for x
    x = 26,879,487,580.61/209,968.12
  6. Step 6: Final answer
    x = 128,016.99

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1.5x scale

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.