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Finding the Fourth Proportional to 66,185,720.80, 99,287,912.40 and 20,742,776.80

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Solution

The fourth proportional to 66,185,720.80, 99,287,912.40 and 20,742,776.80 is: 31,117,089.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,185,720.80 : 99,287,912.40 = 20,742,776.80 : x
  2. Step 2: Convert to fraction form
    66,185,720.80/99,287,912.40 = 20,742,776.80/x
  3. Step 3: Cross multiply
    66,185,720.80x = 99,287,912.40 × 20,742,776.80
  4. Step 4: Simplify right side
    66,185,720.80x = 2,059,507,005,851,152.50
  5. Step 5: Solve for x
    x = 2,059,507,005,851,152.50/66,185,720.80
  6. Step 6: Final answer
    x = 31,117,089.62

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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.