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Finding the Fourth Proportional to 85,638.95, 128,310.76 and 56,769.87

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Solution

The fourth proportional to 85,638.95, 128,310.76 and 56,769.87 is: 85,056.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,638.95 : 128,310.76 = 56,769.87 : x
  2. Step 2: Convert to fraction form
    85,638.95/128,310.76 = 56,769.87/x
  3. Step 3: Cross multiply
    85,638.95x = 128,310.76 × 56,769.87
  4. Step 4: Simplify right side
    85,638.95x = 7,284,185,022.88
  5. Step 5: Solve for x
    x = 7,284,185,022.88/85,638.95
  6. Step 6: Final answer
    x = 85,056.92

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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.