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Finding the Fourth Proportional to 128,478.40, 192,688.80 and 84,414.40

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Solution

The fourth proportional to 128,478.40, 192,688.80 and 84,414.40 is: 126,602.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,478.40 : 192,688.80 = 84,414.40 : x
  2. Step 2: Convert to fraction form
    128,478.40/192,688.80 = 84,414.40/x
  3. Step 3: Cross multiply
    128,478.40x = 192,688.80 × 84,414.40
  4. Step 4: Simplify right side
    128,478.40x = 16,265,709,438.72
  5. Step 5: Solve for x
    x = 16,265,709,438.72/128,478.40
  6. Step 6: Final answer
    x = 126,602.68

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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.