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Finding the Fourth Proportional to 78,897,860.80, 118,262,810.40 and 30,356,958.40

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Solution

The fourth proportional to 78,897,860.80, 118,262,810.40 and 30,356,958.40 is: 45,503,124.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,897,860.80 : 118,262,810.40 = 30,356,958.40 : x
  2. Step 2: Convert to fraction form
    78,897,860.80/118,262,810.40 = 30,356,958.40/x
  3. Step 3: Cross multiply
    78,897,860.80x = 118,262,810.40 × 30,356,958.40
  4. Step 4: Simplify right side
    78,897,860.80x = 3,590,099,215,579,887.50
  5. Step 5: Solve for x
    x = 3,590,099,215,579,887.50/78,897,860.80
  6. Step 6: Final answer
    x = 45,503,124.92

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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.