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Finding the Fourth Proportional to 84,603.69, 126,905.83 and 21,423.79

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Solution

The fourth proportional to 84,603.69, 126,905.83 and 21,423.79 is: 32,135.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,603.69 : 126,905.83 = 21,423.79 : x
  2. Step 2: Convert to fraction form
    84,603.69/126,905.83 = 21,423.79/x
  3. Step 3: Cross multiply
    84,603.69x = 126,905.83 × 21,423.79
  4. Step 4: Simplify right side
    84,603.69x = 2,718,803,956.77
  5. Step 5: Solve for x
    x = 2,718,803,956.77/84,603.69
  6. Step 6: Final answer
    x = 32,135.76

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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.