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Finding the Fourth Proportional to 77,128,330.80, 115,692,496.20 and 77,128,330.80

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Solution

The fourth proportional to 77,128,330.80, 115,692,496.20 and 77,128,330.80 is: 115,692,496.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,128,330.80 : 115,692,496.20 = 77,128,330.80 : x
  2. Step 2: Convert to fraction form
    77,128,330.80/115,692,496.20 = 77,128,330.80/x
  3. Step 3: Cross multiply
    77,128,330.80x = 115,692,496.20 × 77,128,330.80
  4. Step 4: Simplify right side
    77,128,330.80x = 8,923,169,117,991,343
  5. Step 5: Solve for x
    x = 8,923,169,117,991,343/77,128,330.80
  6. Step 6: Final answer
    x = 115,692,496.20

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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.