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Finding the Fourth Proportional to 48,720.60, 73,080.90 and 19,128.60

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Solution

The fourth proportional to 48,720.60, 73,080.90 and 19,128.60 is: 28,692.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    48,720.60 : 73,080.90 = 19,128.60 : x
  2. Step 2: Convert to fraction form
    48,720.60/73,080.90 = 19,128.60/x
  3. Step 3: Cross multiply
    48,720.60x = 73,080.90 × 19,128.60
  4. Step 4: Simplify right side
    48,720.60x = 1,397,935,303.74
  5. Step 5: Solve for x
    x = 1,397,935,303.74/48,720.60
  6. Step 6: Final answer
    x = 28,692.90

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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.