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Finding the Fourth Proportional to 73,129.80, 109,608.30 and 31,009.80

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Solution

The fourth proportional to 73,129.80, 109,608.30 and 31,009.80 is: 46,478.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,129.80 : 109,608.30 = 31,009.80 : x
  2. Step 2: Convert to fraction form
    73,129.80/109,608.30 = 31,009.80/x
  3. Step 3: Cross multiply
    73,129.80x = 109,608.30 × 31,009.80
  4. Step 4: Simplify right side
    73,129.80x = 3,398,931,461.34
  5. Step 5: Solve for x
    x = 3,398,931,461.34/73,129.80
  6. Step 6: Final answer
    x = 46,478.06

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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.