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Finding the Fourth Proportional to 80,911.69, 121,155.30 and 57,090.65

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Solution

The fourth proportional to 80,911.69, 121,155.30 and 57,090.65 is: 85,486.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,911.69 : 121,155.30 = 57,090.65 : x
  2. Step 2: Convert to fraction form
    80,911.69/121,155.30 = 57,090.65/x
  3. Step 3: Cross multiply
    80,911.69x = 121,155.30 × 57,090.65
  4. Step 4: Simplify right side
    80,911.69x = 6,916,834,222.17
  5. Step 5: Solve for x
    x = 6,916,834,222.17/80,911.69
  6. Step 6: Final answer
    x = 85,486.22

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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.