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Finding the Fourth Proportional to 12,463,578.70, 18,695,368.05 and 7,790,980.30

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Solution

The fourth proportional to 12,463,578.70, 18,695,368.05 and 7,790,980.30 is: 11,686,470.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,463,578.70 : 18,695,368.05 = 7,790,980.30 : x
  2. Step 2: Convert to fraction form
    12,463,578.70/18,695,368.05 = 7,790,980.30/x
  3. Step 3: Cross multiply
    12,463,578.70x = 18,695,368.05 × 7,790,980.30
  4. Step 4: Simplify right side
    12,463,578.70x = 145,655,244,178,799.41
  5. Step 5: Solve for x
    x = 145,655,244,178,799.41/12,463,578.70
  6. Step 6: Final answer
    x = 11,686,470.45

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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.