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Finding the Fourth Proportional to 85,851.30, 128,776.95 and 39,195.30

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Solution

The fourth proportional to 85,851.30, 128,776.95 and 39,195.30 is: 58,792.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,851.30 : 128,776.95 = 39,195.30 : x
  2. Step 2: Convert to fraction form
    85,851.30/128,776.95 = 39,195.30/x
  3. Step 3: Cross multiply
    85,851.30x = 128,776.95 × 39,195.30
  4. Step 4: Simplify right side
    85,851.30x = 5,047,451,188.34
  5. Step 5: Solve for x
    x = 5,047,451,188.34/85,851.30
  6. Step 6: Final answer
    x = 58,792.95

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Similar ratio
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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.