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Finding the Fourth Proportional to 210,060.80, 315,138.20 and 76,938.40

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Solution

The fourth proportional to 210,060.80, 315,138.20 and 76,938.40 is: 115,424.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,060.80 : 315,138.20 = 76,938.40 : x
  2. Step 2: Convert to fraction form
    210,060.80/315,138.20 = 76,938.40/x
  3. Step 3: Cross multiply
    210,060.80x = 315,138.20 × 76,938.40
  4. Step 4: Simplify right side
    210,060.80x = 24,246,228,886.88
  5. Step 5: Solve for x
    x = 24,246,228,886.88/210,060.80
  6. Step 6: Final answer
    x = 115,424.81

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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.