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Finding the Fourth Proportional to 68,808,905.80, 103,213,358.70 and 66,163,510.60

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Solution

The fourth proportional to 68,808,905.80, 103,213,358.70 and 66,163,510.60 is: 99,245,265.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,808,905.80 : 103,213,358.70 = 66,163,510.60 : x
  2. Step 2: Convert to fraction form
    68,808,905.80/103,213,358.70 = 66,163,510.60/x
  3. Step 3: Cross multiply
    68,808,905.80x = 103,213,358.70 × 66,163,510.60
  4. Step 4: Simplify right side
    68,808,905.80x = 6,828,958,152,409,053
  5. Step 5: Solve for x
    x = 6,828,958,152,409,053/68,808,905.80
  6. Step 6: Final answer
    x = 99,245,265.90

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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.