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Finding the Fourth Proportional to 91,807,901.20, 128,701,122.80 and 91,807,901.20

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Solution

The fourth proportional to 91,807,901.20, 128,701,122.80 and 91,807,901.20 is: 128,701,122.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,807,901.20 : 128,701,122.80 = 91,807,901.20 : x
  2. Step 2: Convert to fraction form
    91,807,901.20/128,701,122.80 = 91,807,901.20/x
  3. Step 3: Cross multiply
    91,807,901.20x = 128,701,122.80 × 91,807,901.20
  4. Step 4: Simplify right side
    91,807,901.20x = 11,815,779,966,351,468
  5. Step 5: Solve for x
    x = 11,815,779,966,351,468/91,807,901.20
  6. Step 6: Final answer
    x = 128,701,122.80

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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.