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Finding the Fourth Proportional to 66,566,494.80, 99,849,742.20 and 21,131,845.20

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Solution

The fourth proportional to 66,566,494.80, 99,849,742.20 and 21,131,845.20 is: 31,697,767.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,566,494.80 : 99,849,742.20 = 21,131,845.20 : x
  2. Step 2: Convert to fraction form
    66,566,494.80/99,849,742.20 = 21,131,845.20/x
  3. Step 3: Cross multiply
    66,566,494.80x = 99,849,742.20 × 21,131,845.20
  4. Step 4: Simplify right side
    66,566,494.80x = 2,110,009,295,430,307.50
  5. Step 5: Solve for x
    x = 2,110,009,295,430,307.50/66,566,494.80
  6. Step 6: Final answer
    x = 31,697,767.80

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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.