Home / 78,278.12-117,416.88-28,346.54

Finding the Fourth Proportional to 78,278.12, 117,416.88 and 28,346.54

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Solution

The fourth proportional to 78,278.12, 117,416.88 and 28,346.54 is: 42,519.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,278.12 : 117,416.88 = 28,346.54 : x
  2. Step 2: Convert to fraction form
    78,278.12/117,416.88 = 28,346.54/x
  3. Step 3: Cross multiply
    78,278.12x = 117,416.88 × 28,346.54
  4. Step 4: Simplify right side
    78,278.12x = 3,328,362,071.44
  5. Step 5: Solve for x
    x = 3,328,362,071.44/78,278.12
  6. Step 6: Final answer
    x = 42,519.70

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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.