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Finding the Fourth Proportional to 139,639.80, 209,459.70 and 83,652.60

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Solution

The fourth proportional to 139,639.80, 209,459.70 and 83,652.60 is: 125,478.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,639.80 : 209,459.70 = 83,652.60 : x
  2. Step 2: Convert to fraction form
    139,639.80/209,459.70 = 83,652.60/x
  3. Step 3: Cross multiply
    139,639.80x = 209,459.70 × 83,652.60
  4. Step 4: Simplify right side
    139,639.80x = 17,521,848,500.22
  5. Step 5: Solve for x
    x = 17,521,848,500.22/139,639.80
  6. Step 6: Final answer
    x = 125,478.90

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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.