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Finding the Fourth Proportional to 208,089,712.80, 312,040,090.80 and 78,654,304.80

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Solution

The fourth proportional to 208,089,712.80, 312,040,090.80 and 78,654,304.80 is: 117,945,746.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,089,712.80 : 312,040,090.80 = 78,654,304.80 : x
  2. Step 2: Convert to fraction form
    208,089,712.80/312,040,090.80 = 78,654,304.80/x
  3. Step 3: Cross multiply
    208,089,712.80x = 312,040,090.80 × 78,654,304.80
  4. Step 4: Simplify right side
    208,089,712.80x = 24,543,296,411,602,876
  5. Step 5: Solve for x
    x = 24,543,296,411,602,876/208,089,712.80
  6. Step 6: Final answer
    x = 117,945,746.00

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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.