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Finding the Fourth Proportional to 66,432,961.80, 99,649,442.70 and 39,111,208.20

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Solution

The fourth proportional to 66,432,961.80, 99,649,442.70 and 39,111,208.20 is: 58,666,812.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,432,961.80 : 99,649,442.70 = 39,111,208.20 : x
  2. Step 2: Convert to fraction form
    66,432,961.80/99,649,442.70 = 39,111,208.20/x
  3. Step 3: Cross multiply
    66,432,961.80x = 99,649,442.70 × 39,111,208.20
  4. Step 4: Simplify right side
    66,432,961.80x = 3,897,410,100,453,670.50
  5. Step 5: Solve for x
    x = 3,897,410,100,453,670.50/66,432,961.80
  6. Step 6: Final answer
    x = 58,666,812.30

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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.