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Finding the Fourth Proportional to 85,903.40, 128,855.10 and 36,039.80

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Solution

The fourth proportional to 85,903.40, 128,855.10 and 36,039.80 is: 54,059.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,903.40 : 128,855.10 = 36,039.80 : x
  2. Step 2: Convert to fraction form
    85,903.40/128,855.10 = 36,039.80/x
  3. Step 3: Cross multiply
    85,903.40x = 128,855.10 × 36,039.80
  4. Step 4: Simplify right side
    85,903.40x = 4,643,912,032.98
  5. Step 5: Solve for x
    x = 4,643,912,032.98/85,903.40
  6. Step 6: Final answer
    x = 54,059.70

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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.