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Finding the Fourth Proportional to 91,807,793.20, 128,700,971.60 and 91,807,793.20

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Solution

The fourth proportional to 91,807,793.20, 128,700,971.60 and 91,807,793.20 is: 128,700,971.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,807,793.20 : 128,700,971.60 = 91,807,793.20 : x
  2. Step 2: Convert to fraction form
    91,807,793.20/128,700,971.60 = 91,807,793.20/x
  3. Step 3: Cross multiply
    91,807,793.20x = 128,700,971.60 × 91,807,793.20
  4. Step 4: Simplify right side
    91,807,793.20x = 11,815,752,185,291,872
  5. Step 5: Solve for x
    x = 11,815,752,185,291,872/91,807,793.20
  6. Step 6: Final answer
    x = 128,700,971.60

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.