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Finding the Fourth Proportional to 85,903.90, 128,855.85 and 36,040.30

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Solution

The fourth proportional to 85,903.90, 128,855.85 and 36,040.30 is: 54,060.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,903.90 : 128,855.85 = 36,040.30 : x
  2. Step 2: Convert to fraction form
    85,903.90/128,855.85 = 36,040.30/x
  3. Step 3: Cross multiply
    85,903.90x = 128,855.85 × 36,040.30
  4. Step 4: Simplify right side
    85,903.90x = 4,644,003,490.76
  5. Step 5: Solve for x
    x = 4,644,003,490.76/85,903.90
  6. Step 6: Final answer
    x = 54,060.45

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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.