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Finding the Fourth Proportional to 85,918.19, 128,910.15 and 48,520.49

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Solution

The fourth proportional to 85,918.19, 128,910.15 and 48,520.49 is: 72,799.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,918.19 : 128,910.15 = 48,520.49 : x
  2. Step 2: Convert to fraction form
    85,918.19/128,910.15 = 48,520.49/x
  3. Step 3: Cross multiply
    85,918.19x = 128,910.15 × 48,520.49
  4. Step 4: Simplify right side
    85,918.19x = 6,254,782,999.42
  5. Step 5: Solve for x
    x = 6,254,782,999.42/85,918.19
  6. Step 6: Final answer
    x = 72,799.29

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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.