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Finding the Fourth Proportional to 18,886,811.20, 28,330,216.80 and 7,535,406.40

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Solution

The fourth proportional to 18,886,811.20, 28,330,216.80 and 7,535,406.40 is: 11,303,109.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,886,811.20 : 28,330,216.80 = 7,535,406.40 : x
  2. Step 2: Convert to fraction form
    18,886,811.20/28,330,216.80 = 7,535,406.40/x
  3. Step 3: Cross multiply
    18,886,811.20x = 28,330,216.80 × 7,535,406.40
  4. Step 4: Simplify right side
    18,886,811.20x = 213,479,696,988,107.53
  5. Step 5: Solve for x
    x = 213,479,696,988,107.53/18,886,811.20
  6. Step 6: Final answer
    x = 11,303,109.60

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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.