Home / 85,416.37-128,081.54-28,470.10

Finding the Fourth Proportional to 85,416.37, 128,081.54 and 28,470.10

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Solution

The fourth proportional to 85,416.37, 128,081.54 and 28,470.10 is: 42,690.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,416.37 : 128,081.54 = 28,470.10 : x
  2. Step 2: Convert to fraction form
    85,416.37/128,081.54 = 28,470.10/x
  3. Step 3: Cross multiply
    85,416.37x = 128,081.54 × 28,470.10
  4. Step 4: Simplify right side
    85,416.37x = 3,646,494,251.95
  5. Step 5: Solve for x
    x = 3,646,494,251.95/85,416.37
  6. Step 6: Final answer
    x = 42,690.81

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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.