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Finding the Fourth Proportional to 57,865.40, 86,802.90 and 18,421.40

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Solution

The fourth proportional to 57,865.40, 86,802.90 and 18,421.40 is: 27,633.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,865.40 : 86,802.90 = 18,421.40 : x
  2. Step 2: Convert to fraction form
    57,865.40/86,802.90 = 18,421.40/x
  3. Step 3: Cross multiply
    57,865.40x = 86,802.90 × 18,421.40
  4. Step 4: Simplify right side
    57,865.40x = 1,599,030,942.06
  5. Step 5: Solve for x
    x = 1,599,030,942.06/57,865.40
  6. Step 6: Final answer
    x = 27,633.63

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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.