Home / 12,639.49-18,970.87-6,403.84

Finding the Fourth Proportional to 12,639.49, 18,970.87 and 6,403.84

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Solution

The fourth proportional to 12,639.49, 18,970.87 and 6,403.84 is: 9,611.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,639.49 : 18,970.87 = 6,403.84 : x
  2. Step 2: Convert to fraction form
    12,639.49/18,970.87 = 6,403.84/x
  3. Step 3: Cross multiply
    12,639.49x = 18,970.87 × 6,403.84
  4. Step 4: Simplify right side
    12,639.49x = 121,486,416.14
  5. Step 5: Solve for x
    x = 121,486,416.14/12,639.49
  6. Step 6: Final answer
    x = 9,611.65

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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.