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Finding the Fourth Proportional to 7,129,672.40, 10,689,785.40 and 3,936,328.40

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Solution

The fourth proportional to 7,129,672.40, 10,689,785.40 and 3,936,328.40 is: 5,901,884.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,129,672.40 : 10,689,785.40 = 3,936,328.40 : x
  2. Step 2: Convert to fraction form
    7,129,672.40/10,689,785.40 = 3,936,328.40/x
  3. Step 3: Cross multiply
    7,129,672.40x = 10,689,785.40 × 3,936,328.40
  4. Step 4: Simplify right side
    7,129,672.40x = 42,078,505,859,925.36
  5. Step 5: Solve for x
    x = 42,078,505,859,925.36/7,129,672.40
  6. Step 6: Final answer
    x = 5,901,884.90

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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.