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Finding the Fourth Proportional to 85,893.90, 128,938.05 and 50,853.30

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Solution

The fourth proportional to 85,893.90, 128,938.05 and 50,853.30 is: 76,337.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,893.90 : 128,938.05 = 50,853.30 : x
  2. Step 2: Convert to fraction form
    85,893.90/128,938.05 = 50,853.30/x
  3. Step 3: Cross multiply
    85,893.90x = 128,938.05 × 50,853.30
  4. Step 4: Simplify right side
    85,893.90x = 6,556,925,338.07
  5. Step 5: Solve for x
    x = 6,556,925,338.07/85,893.90
  6. Step 6: Final answer
    x = 76,337.50

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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.