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Finding the Fourth Proportional to 85,406.78, 128,188.92 and 43,316.40

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Solution

The fourth proportional to 85,406.78, 128,188.92 and 43,316.40 is: 65,014.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,406.78 : 128,188.92 = 43,316.40 : x
  2. Step 2: Convert to fraction form
    85,406.78/128,188.92 = 43,316.40/x
  3. Step 3: Cross multiply
    85,406.78x = 128,188.92 × 43,316.40
  4. Step 4: Simplify right side
    85,406.78x = 5,552,682,534.29
  5. Step 5: Solve for x
    x = 5,552,682,534.29/85,406.78
  6. Step 6: Final answer
    x = 65,014.54

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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.