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Finding the Fourth Proportional to 255,900.81, 383,919.27 and 87,420.87

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Solution

The fourth proportional to 255,900.81, 383,919.27 and 87,420.87 is: 131,154.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    255,900.81 : 383,919.27 = 87,420.87 : x
  2. Step 2: Convert to fraction form
    255,900.81/383,919.27 = 87,420.87/x
  3. Step 3: Cross multiply
    255,900.81x = 383,919.27 × 87,420.87
  4. Step 4: Simplify right side
    255,900.81x = 33,562,556,593.16
  5. Step 5: Solve for x
    x = 33,562,556,593.16/255,900.81
  6. Step 6: Final answer
    x = 131,154.55

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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.