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Finding the Fourth Proportional to 39,780, 59,670.36 and 12,078

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Solution

The fourth proportional to 39,780, 59,670.36 and 12,078 is: 18,117.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,780 : 59,670.36 = 12,078 : x
  2. Step 2: Convert to fraction form
    39,780/59,670.36 = 12,078/x
  3. Step 3: Cross multiply
    39,780x = 59,670.36 × 12,078
  4. Step 4: Simplify right side
    39,780x = 720,698,608.08
  5. Step 5: Solve for x
    x = 720,698,608.08/39,780
  6. Step 6: Final answer
    x = 18,117.11

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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.