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Finding the Fourth Proportional to 66,471,865.60, 99,698,467.20 and 21,038,252.80

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Solution

The fourth proportional to 66,471,865.60, 99,698,467.20 and 21,038,252.80 is: 31,554,425.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,471,865.60 : 99,698,467.20 = 21,038,252.80 : x
  2. Step 2: Convert to fraction form
    66,471,865.60/99,698,467.20 = 21,038,252.80/x
  3. Step 3: Cross multiply
    66,471,865.60x = 99,698,467.20 × 21,038,252.80
  4. Step 4: Simplify right side
    66,471,865.60x = 2,097,481,556,726,108.25
  5. Step 5: Solve for x
    x = 2,097,481,556,726,108.25/66,471,865.60
  6. Step 6: Final answer
    x = 31,554,425.89

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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.