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Finding the Fourth Proportional to 85,907.12, 128,942.75 and 52,692.12

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Solution

The fourth proportional to 85,907.12, 128,942.75 and 52,692.12 is: 79,088.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,907.12 : 128,942.75 = 52,692.12 : x
  2. Step 2: Convert to fraction form
    85,907.12/128,942.75 = 52,692.12/x
  3. Step 3: Cross multiply
    85,907.12x = 128,942.75 × 52,692.12
  4. Step 4: Simplify right side
    85,907.12x = 6,794,266,987.86
  5. Step 5: Solve for x
    x = 6,794,266,987.86/85,907.12
  6. Step 6: Final answer
    x = 79,088.52

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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.