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Finding the Fourth Proportional to 128,719.45, 177,603.87 and 77,740.48

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Solution

The fourth proportional to 128,719.45, 177,603.87 and 77,740.48 is: 107,264.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,719.45 : 177,603.87 = 77,740.48 : x
  2. Step 2: Convert to fraction form
    128,719.45/177,603.87 = 77,740.48/x
  3. Step 3: Cross multiply
    128,719.45x = 177,603.87 × 77,740.48
  4. Step 4: Simplify right side
    128,719.45x = 13,807,010,103.66
  5. Step 5: Solve for x
    x = 13,807,010,103.66/128,719.45
  6. Step 6: Final answer
    x = 107,264.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.