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Finding the Fourth Proportional to 71,900.80, 107,851.20 and 19,315.60

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Solution

The fourth proportional to 71,900.80, 107,851.20 and 19,315.60 is: 28,973.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,900.80 : 107,851.20 = 19,315.60 : x
  2. Step 2: Convert to fraction form
    71,900.80/107,851.20 = 19,315.60/x
  3. Step 3: Cross multiply
    71,900.80x = 107,851.20 × 19,315.60
  4. Step 4: Simplify right side
    71,900.80x = 2,083,210,638.72
  5. Step 5: Solve for x
    x = 2,083,210,638.72/71,900.80
  6. Step 6: Final answer
    x = 28,973.40

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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.