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Finding the Fourth Proportional to 85,840.05, 128,760.08 and 39,184.05

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Solution

The fourth proportional to 85,840.05, 128,760.08 and 39,184.05 is: 58,776.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,840.05 : 128,760.08 = 39,184.05 : x
  2. Step 2: Convert to fraction form
    85,840.05/128,760.08 = 39,184.05/x
  3. Step 3: Cross multiply
    85,840.05x = 128,760.08 × 39,184.05
  4. Step 4: Simplify right side
    85,840.05x = 5,045,341,216.80
  5. Step 5: Solve for x
    x = 5,045,341,216.80/85,840.05
  6. Step 6: Final answer
    x = 58,776.08

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Double scale
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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.