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Finding the Fourth Proportional to 326,086.40, 489,129.60 and 89,428.70

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Solution

The fourth proportional to 326,086.40, 489,129.60 and 89,428.70 is: 134,143.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,086.40 : 489,129.60 = 89,428.70 : x
  2. Step 2: Convert to fraction form
    326,086.40/489,129.60 = 89,428.70/x
  3. Step 3: Cross multiply
    326,086.40x = 489,129.60 × 89,428.70
  4. Step 4: Simplify right side
    326,086.40x = 43,742,224,259.52
  5. Step 5: Solve for x
    x = 43,742,224,259.52/326,086.40
  6. Step 6: Final answer
    x = 134,143.05

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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.