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Finding the Fourth Proportional to 78,149.67, 117,222.88 and 18,985.65

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Solution

The fourth proportional to 78,149.67, 117,222.88 and 18,985.65 is: 28,478.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,149.67 : 117,222.88 = 18,985.65 : x
  2. Step 2: Convert to fraction form
    78,149.67/117,222.88 = 18,985.65/x
  3. Step 3: Cross multiply
    78,149.67x = 117,222.88 × 18,985.65
  4. Step 4: Simplify right side
    78,149.67x = 2,225,552,571.67
  5. Step 5: Solve for x
    x = 2,225,552,571.67/78,149.67
  6. Step 6: Final answer
    x = 28,478.08

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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.