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Finding the Fourth Proportional to 139,989.60, 209,984.40 and 100,623.60

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Solution

The fourth proportional to 139,989.60, 209,984.40 and 100,623.60 is: 150,935.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,989.60 : 209,984.40 = 100,623.60 : x
  2. Step 2: Convert to fraction form
    139,989.60/209,984.40 = 100,623.60/x
  3. Step 3: Cross multiply
    139,989.60x = 209,984.40 × 100,623.60
  4. Step 4: Simplify right side
    139,989.60x = 21,129,386,271.84
  5. Step 5: Solve for x
    x = 21,129,386,271.84/139,989.60
  6. Step 6: Final answer
    x = 150,935.40

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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.