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Finding the Fourth Proportional to 326,085.40, 489,128.10 and 89,427.70

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Solution

The fourth proportional to 326,085.40, 489,128.10 and 89,427.70 is: 134,141.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,085.40 : 489,128.10 = 89,427.70 : x
  2. Step 2: Convert to fraction form
    326,085.40/489,128.10 = 89,427.70/x
  3. Step 3: Cross multiply
    326,085.40x = 489,128.10 × 89,427.70
  4. Step 4: Simplify right side
    326,085.40x = 43,741,600,988.37
  5. Step 5: Solve for x
    x = 43,741,600,988.37/326,085.40
  6. Step 6: Final answer
    x = 134,141.55

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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.