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Finding the Fourth Proportional to 128,592.77, 192,705.35 and 72,314.75

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Solution

The fourth proportional to 128,592.77, 192,705.35 and 72,314.75 is: 108,368.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,592.77 : 192,705.35 = 72,314.75 : x
  2. Step 2: Convert to fraction form
    128,592.77/192,705.35 = 72,314.75/x
  3. Step 3: Cross multiply
    128,592.77x = 192,705.35 × 72,314.75
  4. Step 4: Simplify right side
    128,592.77x = 13,935,439,208.91
  5. Step 5: Solve for x
    x = 13,935,439,208.91/128,592.77
  6. Step 6: Final answer
    x = 108,368.76

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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.