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Finding the Fourth Proportional to 258,998.80, 388,498.20 and 72,010.30

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Solution

The fourth proportional to 258,998.80, 388,498.20 and 72,010.30 is: 108,015.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,998.80 : 388,498.20 = 72,010.30 : x
  2. Step 2: Convert to fraction form
    258,998.80/388,498.20 = 72,010.30/x
  3. Step 3: Cross multiply
    258,998.80x = 388,498.20 × 72,010.30
  4. Step 4: Simplify right side
    258,998.80x = 27,975,871,931.46
  5. Step 5: Solve for x
    x = 27,975,871,931.46/258,998.80
  6. Step 6: Final answer
    x = 108,015.45

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Similar ratio
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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.