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Finding the Fourth Proportional to 85,353.88, 128,056.44 and 40,409.50

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Solution

The fourth proportional to 85,353.88, 128,056.44 and 40,409.50 is: 60,626.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,353.88 : 128,056.44 = 40,409.50 : x
  2. Step 2: Convert to fraction form
    85,353.88/128,056.44 = 40,409.50/x
  3. Step 3: Cross multiply
    85,353.88x = 128,056.44 × 40,409.50
  4. Step 4: Simplify right side
    85,353.88x = 5,174,696,071.90
  5. Step 5: Solve for x
    x = 5,174,696,071.90/85,353.88
  6. Step 6: Final answer
    x = 60,626.38

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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.