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Finding the Fourth Proportional to 21,178,864.80, 31,768,297.20 and 21,178,864.80

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Solution

The fourth proportional to 21,178,864.80, 31,768,297.20 and 21,178,864.80 is: 31,768,297.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,178,864.80 : 31,768,297.20 = 21,178,864.80 : x
  2. Step 2: Convert to fraction form
    21,178,864.80/31,768,297.20 = 21,178,864.80/x
  3. Step 3: Cross multiply
    21,178,864.80x = 31,768,297.20 × 21,178,864.80
  4. Step 4: Simplify right side
    21,178,864.80x = 672,816,471,325,018.62
  5. Step 5: Solve for x
    x = 672,816,471,325,018.62/21,178,864.80
  6. Step 6: Final answer
    x = 31,768,297.20

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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.