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Finding the Fourth Proportional to 81,192,655.40, 121,788,983.10 and 81,192,655.40

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Solution

The fourth proportional to 81,192,655.40, 121,788,983.10 and 81,192,655.40 is: 121,788,983.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,192,655.40 : 121,788,983.10 = 81,192,655.40 : x
  2. Step 2: Convert to fraction form
    81,192,655.40/121,788,983.10 = 81,192,655.40/x
  3. Step 3: Cross multiply
    81,192,655.40x = 121,788,983.10 × 81,192,655.40
  4. Step 4: Simplify right side
    81,192,655.40x = 9,888,370,936,354,724
  5. Step 5: Solve for x
    x = 9,888,370,936,354,724/81,192,655.40
  6. Step 6: Final answer
    x = 121,788,983.10

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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.