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Finding the Fourth Proportional to 72,806,603.80, 109,209,905.70 and 61,327,478.20

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Solution

The fourth proportional to 72,806,603.80, 109,209,905.70 and 61,327,478.20 is: 91,991,217.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,806,603.80 : 109,209,905.70 = 61,327,478.20 : x
  2. Step 2: Convert to fraction form
    72,806,603.80/109,209,905.70 = 61,327,478.20/x
  3. Step 3: Cross multiply
    72,806,603.80x = 109,209,905.70 × 61,327,478.20
  4. Step 4: Simplify right side
    72,806,603.80x = 6,697,568,111,040,806
  5. Step 5: Solve for x
    x = 6,697,568,111,040,806/72,806,603.80
  6. Step 6: Final answer
    x = 91,991,217.30

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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.