Home / 139,981.40-209,972.10-86,837.30

Finding the Fourth Proportional to 139,981.40, 209,972.10 and 86,837.30

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Solution

The fourth proportional to 139,981.40, 209,972.10 and 86,837.30 is: 130,255.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,981.40 : 209,972.10 = 86,837.30 : x
  2. Step 2: Convert to fraction form
    139,981.40/209,972.10 = 86,837.30/x
  3. Step 3: Cross multiply
    139,981.40x = 209,972.10 × 86,837.30
  4. Step 4: Simplify right side
    139,981.40x = 18,233,410,239.33
  5. Step 5: Solve for x
    x = 18,233,410,239.33/139,981.40
  6. Step 6: Final answer
    x = 130,255.95

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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.