Home / 129,631.84-178,890.86-72,270.50

Finding the Fourth Proportional to 129,631.84, 178,890.86 and 72,270.50

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Solution

The fourth proportional to 129,631.84, 178,890.86 and 72,270.50 is: 99,732.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,631.84 : 178,890.86 = 72,270.50 : x
  2. Step 2: Convert to fraction form
    129,631.84/178,890.86 = 72,270.50/x
  3. Step 3: Cross multiply
    129,631.84x = 178,890.86 × 72,270.50
  4. Step 4: Simplify right side
    129,631.84x = 12,928,531,897.63
  5. Step 5: Solve for x
    x = 12,928,531,897.63/129,631.84
  6. Step 6: Final answer
    x = 99,732.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.