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Finding the Fourth Proportional to 128,958.39, 177,970.47 and 72,369.75

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Solution

The fourth proportional to 128,958.39, 177,970.47 and 72,369.75 is: 99,874.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,958.39 : 177,970.47 = 72,369.75 : x
  2. Step 2: Convert to fraction form
    128,958.39/177,970.47 = 72,369.75/x
  3. Step 3: Cross multiply
    128,958.39x = 177,970.47 × 72,369.75
  4. Step 4: Simplify right side
    128,958.39x = 12,879,678,421.28
  5. Step 5: Solve for x
    x = 12,879,678,421.28/128,958.39
  6. Step 6: Final answer
    x = 99,874.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.