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Finding the Fourth Proportional to 103,405.10, 155,107.65 and 28,536.80

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Solution

The fourth proportional to 103,405.10, 155,107.65 and 28,536.80 is: 42,805.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,405.10 : 155,107.65 = 28,536.80 : x
  2. Step 2: Convert to fraction form
    103,405.10/155,107.65 = 28,536.80/x
  3. Step 3: Cross multiply
    103,405.10x = 155,107.65 × 28,536.80
  4. Step 4: Simplify right side
    103,405.10x = 4,426,275,986.52
  5. Step 5: Solve for x
    x = 4,426,275,986.52/103,405.10
  6. Step 6: Final answer
    x = 42,805.20

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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.