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Finding the Fourth Proportional to 85,388.85, 128,016.95 and 55,339.65

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Solution

The fourth proportional to 85,388.85, 128,016.95 and 55,339.65 is: 82,966.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,388.85 : 128,016.95 = 55,339.65 : x
  2. Step 2: Convert to fraction form
    85,388.85/128,016.95 = 55,339.65/x
  3. Step 3: Cross multiply
    85,388.85x = 128,016.95 × 55,339.65
  4. Step 4: Simplify right side
    85,388.85x = 7,084,412,930.37
  5. Step 5: Solve for x
    x = 7,084,412,930.37/85,388.85
  6. Step 6: Final answer
    x = 82,966.49

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1.5x scale

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.