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Finding the Fourth Proportional to 85,882.34, 128,692.13 and 45,907.01

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Solution

The fourth proportional to 85,882.34, 128,692.13 and 45,907.01 is: 68,790.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,882.34 : 128,692.13 = 45,907.01 : x
  2. Step 2: Convert to fraction form
    85,882.34/128,692.13 = 45,907.01/x
  3. Step 3: Cross multiply
    85,882.34x = 128,692.13 × 45,907.01
  4. Step 4: Simplify right side
    85,882.34x = 5,907,870,898.83
  5. Step 5: Solve for x
    x = 5,907,870,898.83/85,882.34
  6. Step 6: Final answer
    x = 68,790.29

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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.