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Finding the Fourth Proportional to 66,257,040.80, 99,388,930.80 and 20,819,280.80

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Solution

The fourth proportional to 66,257,040.80, 99,388,930.80 and 20,819,280.80 is: 31,229,980.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,257,040.80 : 99,388,930.80 = 20,819,280.80 : x
  2. Step 2: Convert to fraction form
    66,257,040.80/99,388,930.80 = 20,819,280.80/x
  3. Step 3: Cross multiply
    66,257,040.80x = 99,388,930.80 × 20,819,280.80
  4. Step 4: Simplify right side
    66,257,040.80x = 2,069,206,058,736,968.75
  5. Step 5: Solve for x
    x = 2,069,206,058,736,968.75/66,257,040.80
  6. Step 6: Final answer
    x = 31,229,980.00

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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.