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Finding the Fourth Proportional to 85,603.91, 128,218.61 and 43,411.28

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Solution

The fourth proportional to 85,603.91, 128,218.61 and 43,411.28 is: 65,021.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,603.91 : 128,218.61 = 43,411.28 : x
  2. Step 2: Convert to fraction form
    85,603.91/128,218.61 = 43,411.28/x
  3. Step 3: Cross multiply
    85,603.91x = 128,218.61 × 43,411.28
  4. Step 4: Simplify right side
    85,603.91x = 5,566,133,447.36
  5. Step 5: Solve for x
    x = 5,566,133,447.36/85,603.91
  6. Step 6: Final answer
    x = 65,021.96

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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.