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Finding the Fourth Proportional to 81,371,332.80, 122,256,064.80 and 61,215,940.80

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Solution

The fourth proportional to 81,371,332.80, 122,256,064.80 and 61,215,940.80 is: 91,973,668.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,371,332.80 : 122,256,064.80 = 61,215,940.80 : x
  2. Step 2: Convert to fraction form
    81,371,332.80/122,256,064.80 = 61,215,940.80/x
  3. Step 3: Cross multiply
    81,371,332.80x = 122,256,064.80 × 61,215,940.80
  4. Step 4: Simplify right side
    81,371,332.80x = 7,484,020,025,237,763
  5. Step 5: Solve for x
    x = 7,484,020,025,237,763/81,371,332.80
  6. Step 6: Final answer
    x = 91,973,668.95

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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.