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Finding the Fourth Proportional to 48,612, 72,918 and 15,780

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Solution

The fourth proportional to 48,612, 72,918 and 15,780 is: 23,670

Step by Step Solution

  1. Step 1: Write the proportion equation
    48,612 : 72,918 = 15,780 : x
  2. Step 2: Convert to fraction form
    48,612/72,918 = 15,780/x
  3. Step 3: Cross multiply
    48,612x = 72,918 × 15,780
  4. Step 4: Simplify right side
    48,612x = 1,150,646,040
  5. Step 5: Solve for x
    x = 1,150,646,040/48,612
  6. Step 6: Final answer
    x = 23,670

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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.