Home / 205,990.16-309,115.20-87,661.40

Finding the Fourth Proportional to 205,990.16, 309,115.20 and 87,661.40

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Solution

The fourth proportional to 205,990.16, 309,115.20 and 87,661.40 is: 131,547.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,990.16 : 309,115.20 = 87,661.40 : x
  2. Step 2: Convert to fraction form
    205,990.16/309,115.20 = 87,661.40/x
  3. Step 3: Cross multiply
    205,990.16x = 309,115.20 × 87,661.40
  4. Step 4: Simplify right side
    205,990.16x = 27,097,471,193.28
  5. Step 5: Solve for x
    x = 27,097,471,193.28/205,990.16
  6. Step 6: Final answer
    x = 131,547.41

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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.