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Finding the Fourth Proportional to 72,321,193.16, 99,803,978.94 and 39,282,087.44

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Solution

The fourth proportional to 72,321,193.16, 99,803,978.94 and 39,282,087.44 is: 54,209,678.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,321,193.16 : 99,803,978.94 = 39,282,087.44 : x
  2. Step 2: Convert to fraction form
    72,321,193.16/99,803,978.94 = 39,282,087.44/x
  3. Step 3: Cross multiply
    72,321,193.16x = 99,803,978.94 × 39,282,087.44
  4. Step 4: Simplify right side
    72,321,193.16x = 3,920,508,627,580,998
  5. Step 5: Solve for x
    x = 3,920,508,627,580,998/72,321,193.16
  6. Step 6: Final answer
    x = 54,209,678.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.