Home / 85,981.60-128,929.20-39,181.60

Finding the Fourth Proportional to 85,981.60, 128,929.20 and 39,181.60

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Solution

The fourth proportional to 85,981.60, 128,929.20 and 39,181.60 is: 58,752.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,981.60 : 128,929.20 = 39,181.60 : x
  2. Step 2: Convert to fraction form
    85,981.60/128,929.20 = 39,181.60/x
  3. Step 3: Cross multiply
    85,981.60x = 128,929.20 × 39,181.60
  4. Step 4: Simplify right side
    85,981.60x = 5,051,652,342.72
  5. Step 5: Solve for x
    x = 5,051,652,342.72/85,981.60
  6. Step 6: Final answer
    x = 58,752.71

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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.