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Finding the Fourth Proportional to 128,378.57, 192,613.44 and 57,294.74

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Solution

The fourth proportional to 128,378.57, 192,613.44 and 57,294.74 is: 85,962.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,378.57 : 192,613.44 = 57,294.74 : x
  2. Step 2: Convert to fraction form
    128,378.57/192,613.44 = 57,294.74/x
  3. Step 3: Cross multiply
    128,378.57x = 192,613.44 × 57,294.74
  4. Step 4: Simplify right side
    128,378.57x = 11,035,737,661.69
  5. Step 5: Solve for x
    x = 11,035,737,661.69/128,378.57
  6. Step 6: Final answer
    x = 85,962.46

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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.