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Finding the Fourth Proportional to 92,911.45, 128,218.47 and 50,470

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Solution

The fourth proportional to 92,911.45, 128,218.47 and 50,470 is: 69,648.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,911.45 : 128,218.47 = 50,470 : x
  2. Step 2: Convert to fraction form
    92,911.45/128,218.47 = 50,470/x
  3. Step 3: Cross multiply
    92,911.45x = 128,218.47 × 50,470
  4. Step 4: Simplify right side
    92,911.45x = 6,471,186,180.90
  5. Step 5: Solve for x
    x = 6,471,186,180.90/92,911.45
  6. Step 6: Final answer
    x = 69,648.96

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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.