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Finding the Fourth Proportional to 85,873.54, 128,888.89 and 43,783.80

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Solution

The fourth proportional to 85,873.54, 128,888.89 and 43,783.80 is: 65,715.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,873.54 : 128,888.89 = 43,783.80 : x
  2. Step 2: Convert to fraction form
    85,873.54/128,888.89 = 43,783.80/x
  3. Step 3: Cross multiply
    85,873.54x = 128,888.89 × 43,783.80
  4. Step 4: Simplify right side
    85,873.54x = 5,643,245,381.98
  5. Step 5: Solve for x
    x = 5,643,245,381.98/85,873.54
  6. Step 6: Final answer
    x = 65,715.77

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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.