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Finding the Fourth Proportional to 85,421.94, 128,043.75 and 29,245.50

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Solution

The fourth proportional to 85,421.94, 128,043.75 and 29,245.50 is: 43,837.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,421.94 : 128,043.75 = 29,245.50 : x
  2. Step 2: Convert to fraction form
    85,421.94/128,043.75 = 29,245.50/x
  3. Step 3: Cross multiply
    85,421.94x = 128,043.75 × 29,245.50
  4. Step 4: Simplify right side
    85,421.94x = 3,744,703,490.63
  5. Step 5: Solve for x
    x = 3,744,703,490.63/85,421.94
  6. Step 6: Final answer
    x = 43,837.72

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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.