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Finding the Fourth Proportional to 85,409.35, 128,192.42 and 43,318.74

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Solution

The fourth proportional to 85,409.35, 128,192.42 and 43,318.74 is: 65,017.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,409.35 : 128,192.42 = 43,318.74 : x
  2. Step 2: Convert to fraction form
    85,409.35/128,192.42 = 43,318.74/x
  3. Step 3: Cross multiply
    85,409.35x = 128,192.42 × 43,318.74
  4. Step 4: Simplify right side
    85,409.35x = 5,553,134,111.95
  5. Step 5: Solve for x
    x = 5,553,134,111.95/85,409.35
  6. Step 6: Final answer
    x = 65,017.87

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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.