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Finding the Fourth Proportional to 128,538.94, 192,888.24 and 61,985.92

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Solution

The fourth proportional to 128,538.94, 192,888.24 and 61,985.92 is: 93,017.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,538.94 : 192,888.24 = 61,985.92 : x
  2. Step 2: Convert to fraction form
    128,538.94/192,888.24 = 61,985.92/x
  3. Step 3: Cross multiply
    128,538.94x = 192,888.24 × 61,985.92
  4. Step 4: Simplify right side
    128,538.94x = 11,956,355,013.58
  5. Step 5: Solve for x
    x = 11,956,355,013.58/128,538.94
  6. Step 6: Final answer
    x = 93,017.38

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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.