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Finding the Fourth Proportional to 72,134.69, 108,210.77 and 30,043.31

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Solution

The fourth proportional to 72,134.69, 108,210.77 and 30,043.31 is: 45,068.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,134.69 : 108,210.77 = 30,043.31 : x
  2. Step 2: Convert to fraction form
    72,134.69/108,210.77 = 30,043.31/x
  3. Step 3: Cross multiply
    72,134.69x = 108,210.77 × 30,043.31
  4. Step 4: Simplify right side
    72,134.69x = 3,251,009,129.84
  5. Step 5: Solve for x
    x = 3,251,009,129.84/72,134.69
  6. Step 6: Final answer
    x = 45,068.60

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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.