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Finding the Fourth Proportional to 66,428,908.40, 99,643,362.60 and 40,786,770.80

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Solution

The fourth proportional to 66,428,908.40, 99,643,362.60 and 40,786,770.80 is: 61,180,156.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,428,908.40 : 99,643,362.60 = 40,786,770.80 : x
  2. Step 2: Convert to fraction form
    66,428,908.40/99,643,362.60 = 40,786,770.80/x
  3. Step 3: Cross multiply
    66,428,908.40x = 99,643,362.60 × 40,786,770.80
  4. Step 4: Simplify right side
    66,428,908.40x = 4,064,130,992,107,491.50
  5. Step 5: Solve for x
    x = 4,064,130,992,107,491.50/66,428,908.40
  6. Step 6: Final answer
    x = 61,180,156.20

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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.