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Finding the Fourth Proportional to 39,908.80, 55,070.40 and 23,140

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Solution

The fourth proportional to 39,908.80, 55,070.40 and 23,140 is: 31,931.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,908.80 : 55,070.40 = 23,140 : x
  2. Step 2: Convert to fraction form
    39,908.80/55,070.40 = 23,140/x
  3. Step 3: Cross multiply
    39,908.80x = 55,070.40 × 23,140
  4. Step 4: Simplify right side
    39,908.80x = 1,274,329,056
  5. Step 5: Solve for x
    x = 1,274,329,056/39,908.80
  6. Step 6: Final answer
    x = 31,931.03

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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.