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Finding the Fourth Proportional to 85,651.82, 128,425.70 and 42,907.54

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Solution

The fourth proportional to 85,651.82, 128,425.70 and 42,907.54 is: 64,335.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,651.82 : 128,425.70 = 42,907.54 : x
  2. Step 2: Convert to fraction form
    85,651.82/128,425.70 = 42,907.54/x
  3. Step 3: Cross multiply
    85,651.82x = 128,425.70 × 42,907.54
  4. Step 4: Simplify right side
    85,651.82x = 5,510,430,645.98
  5. Step 5: Solve for x
    x = 5,510,430,645.98/85,651.82
  6. Step 6: Final answer
    x = 64,335.24

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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.