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Finding the Fourth Proportional to 72,609.36, 108,920.76 and 28,239.48

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Solution

The fourth proportional to 72,609.36, 108,920.76 and 28,239.48 is: 42,361.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,609.36 : 108,920.76 = 28,239.48 : x
  2. Step 2: Convert to fraction form
    72,609.36/108,920.76 = 28,239.48/x
  3. Step 3: Cross multiply
    72,609.36x = 108,920.76 × 28,239.48
  4. Step 4: Simplify right side
    72,609.36x = 3,075,865,623.60
  5. Step 5: Solve for x
    x = 3,075,865,623.60/72,609.36
  6. Step 6: Final answer
    x = 42,361.83

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1.5x scale

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.