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Finding the Fourth Proportional to 128,521.60, 192,683.55 and 65,289.76

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Solution

The fourth proportional to 128,521.60, 192,683.55 and 65,289.76 is: 97,884.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,521.60 : 192,683.55 = 65,289.76 : x
  2. Step 2: Convert to fraction form
    128,521.60/192,683.55 = 65,289.76/x
  3. Step 3: Cross multiply
    128,521.60x = 192,683.55 × 65,289.76
  4. Step 4: Simplify right side
    128,521.60x = 12,580,262,735.45
  5. Step 5: Solve for x
    x = 12,580,262,735.45/128,521.60
  6. Step 6: Final answer
    x = 97,884.42

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1.5x scale

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.