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Finding the Fourth Proportional to 92,831.78, 128,108 and 50,390.34

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Solution

The fourth proportional to 92,831.78, 128,108 and 50,390.34 is: 69,538.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,831.78 : 128,108 = 50,390.34 : x
  2. Step 2: Convert to fraction form
    92,831.78/128,108 = 50,390.34/x
  3. Step 3: Cross multiply
    92,831.78x = 128,108 × 50,390.34
  4. Step 4: Simplify right side
    92,831.78x = 6,455,405,676.72
  5. Step 5: Solve for x
    x = 6,455,405,676.72/92,831.78
  6. Step 6: Final answer
    x = 69,538.75

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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.