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Finding the Fourth Proportional to 128,589.54, 192,830.19 and 48,613.98

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Solution

The fourth proportional to 128,589.54, 192,830.19 and 48,613.98 is: 72,900.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,589.54 : 192,830.19 = 48,613.98 : x
  2. Step 2: Convert to fraction form
    128,589.54/192,830.19 = 48,613.98/x
  3. Step 3: Cross multiply
    128,589.54x = 192,830.19 × 48,613.98
  4. Step 4: Simplify right side
    128,589.54x = 9,374,243,000.06
  5. Step 5: Solve for x
    x = 9,374,243,000.06/128,589.54
  6. Step 6: Final answer
    x = 72,900.51

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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.