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Finding the Fourth Proportional to 85,409.85, 128,230.20 and 49,907.55

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Solution

The fourth proportional to 85,409.85, 128,230.20 and 49,907.55 is: 74,928.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,409.85 : 128,230.20 = 49,907.55 : x
  2. Step 2: Convert to fraction form
    85,409.85/128,230.20 = 49,907.55/x
  3. Step 3: Cross multiply
    85,409.85x = 128,230.20 × 49,907.55
  4. Step 4: Simplify right side
    85,409.85x = 6,399,655,118.01
  5. Step 5: Solve for x
    x = 6,399,655,118.01/85,409.85
  6. Step 6: Final answer
    x = 74,928.77

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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.