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Finding the Fourth Proportional to 326,439.82, 489,603.30 and 86,555.26

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Solution

The fourth proportional to 326,439.82, 489,603.30 and 86,555.26 is: 129,817.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,439.82 : 489,603.30 = 86,555.26 : x
  2. Step 2: Convert to fraction form
    326,439.82/489,603.30 = 86,555.26/x
  3. Step 3: Cross multiply
    326,439.82x = 489,603.30 × 86,555.26
  4. Step 4: Simplify right side
    326,439.82x = 42,377,740,928.36
  5. Step 5: Solve for x
    x = 42,377,740,928.36/326,439.82
  6. Step 6: Final answer
    x = 129,817.93

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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.