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Finding the Fourth Proportional to 78,456.56, 117,647.88 and 28,501.44

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Solution

The fourth proportional to 78,456.56, 117,647.88 and 28,501.44 is: 42,738.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,456.56 : 117,647.88 = 28,501.44 : x
  2. Step 2: Convert to fraction form
    78,456.56/117,647.88 = 28,501.44/x
  3. Step 3: Cross multiply
    78,456.56x = 117,647.88 × 28,501.44
  4. Step 4: Simplify right side
    78,456.56x = 3,353,133,992.95
  5. Step 5: Solve for x
    x = 3,353,133,992.95/78,456.56
  6. Step 6: Final answer
    x = 42,738.73

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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.