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Finding the Fourth Proportional to 85,311.08, 128,045.15 and 43,220.44

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Solution

The fourth proportional to 85,311.08, 128,045.15 and 43,220.44 is: 64,870.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,311.08 : 128,045.15 = 43,220.44 : x
  2. Step 2: Convert to fraction form
    85,311.08/128,045.15 = 43,220.44/x
  3. Step 3: Cross multiply
    85,311.08x = 128,045.15 × 43,220.44
  4. Step 4: Simplify right side
    85,311.08x = 5,534,166,866.54
  5. Step 5: Solve for x
    x = 5,534,166,866.54/85,311.08
  6. Step 6: Final answer
    x = 64,870.44

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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.