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Finding the Fourth Proportional to 85,328.40, 128,138.40 and 55,876.80

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Solution

The fourth proportional to 85,328.40, 128,138.40 and 55,876.80 is: 83,910.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,328.40 : 128,138.40 = 55,876.80 : x
  2. Step 2: Convert to fraction form
    85,328.40/128,138.40 = 55,876.80/x
  3. Step 3: Cross multiply
    85,328.40x = 128,138.40 × 55,876.80
  4. Step 4: Simplify right side
    85,328.40x = 7,159,963,749.12
  5. Step 5: Solve for x
    x = 7,159,963,749.12/85,328.40
  6. Step 6: Final answer
    x = 83,910.68

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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.