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Finding the Fourth Proportional to 61,205,244.60, 91,807,866.90 and 20,815,728.60

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Solution

The fourth proportional to 61,205,244.60, 91,807,866.90 and 20,815,728.60 is: 31,223,592.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,205,244.60 : 91,807,866.90 = 20,815,728.60 : x
  2. Step 2: Convert to fraction form
    61,205,244.60/91,807,866.90 = 20,815,728.60/x
  3. Step 3: Cross multiply
    61,205,244.60x = 91,807,866.90 × 20,815,728.60
  4. Step 4: Simplify right side
    61,205,244.60x = 1,911,047,640,735,323.50
  5. Step 5: Solve for x
    x = 1,911,047,640,735,323.50/61,205,244.60
  6. Step 6: Final answer
    x = 31,223,592.90

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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.