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Finding the Fourth Proportional to 74,914.80, 112,415.40 and 28,201.20

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Solution

The fourth proportional to 74,914.80, 112,415.40 and 28,201.20 is: 42,318.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,914.80 : 112,415.40 = 28,201.20 : x
  2. Step 2: Convert to fraction form
    74,914.80/112,415.40 = 28,201.20/x
  3. Step 3: Cross multiply
    74,914.80x = 112,415.40 × 28,201.20
  4. Step 4: Simplify right side
    74,914.80x = 3,170,249,178.48
  5. Step 5: Solve for x
    x = 3,170,249,178.48/74,914.80
  6. Step 6: Final answer
    x = 42,318.06

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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.