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Finding the Fourth Proportional to 85,900.61, 128,901.33 and 35,976.87

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Solution

The fourth proportional to 85,900.61, 128,901.33 and 35,976.87 is: 53,986.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,900.61 : 128,901.33 = 35,976.87 : x
  2. Step 2: Convert to fraction form
    85,900.61/128,901.33 = 35,976.87/x
  3. Step 3: Cross multiply
    85,900.61x = 128,901.33 × 35,976.87
  4. Step 4: Simplify right side
    85,900.61x = 4,637,466,392.24
  5. Step 5: Solve for x
    x = 4,637,466,392.24/85,900.61
  6. Step 6: Final answer
    x = 53,986.42

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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.