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Finding the Fourth Proportional to 85,692.75, 128,630.85 and 72,526.65

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Solution

The fourth proportional to 85,692.75, 128,630.85 and 72,526.65 is: 108,867.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,692.75 : 128,630.85 = 72,526.65 : x
  2. Step 2: Convert to fraction form
    85,692.75/128,630.85 = 72,526.65/x
  3. Step 3: Cross multiply
    85,692.75x = 128,630.85 × 72,526.65
  4. Step 4: Simplify right side
    85,692.75x = 9,329,164,637.15
  5. Step 5: Solve for x
    x = 9,329,164,637.15/85,692.75
  6. Step 6: Final answer
    x = 108,867.61

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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.