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Finding the Fourth Proportional to 661,119,796.80, 991,679,695.20 and 620,809,012.80

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Solution

The fourth proportional to 661,119,796.80, 991,679,695.20 and 620,809,012.80 is: 931,213,519.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,119,796.80 : 991,679,695.20 = 620,809,012.80 : x
  2. Step 2: Convert to fraction form
    661,119,796.80/991,679,695.20 = 620,809,012.80/x
  3. Step 3: Cross multiply
    661,119,796.80x = 991,679,695.20 × 620,809,012.80
  4. Step 4: Simplify right side
    661,119,796.80x = 615,643,692,590,916,864
  5. Step 5: Solve for x
    x = 615,643,692,590,916,864/661,119,796.80
  6. Step 6: Final answer
    x = 931,213,519.20

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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.