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Finding the Fourth Proportional to 85,000.58, 128,006.89 and 74,039.66

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Solution

The fourth proportional to 85,000.58, 128,006.89 and 74,039.66 is: 111,500.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,000.58 : 128,006.89 = 74,039.66 : x
  2. Step 2: Convert to fraction form
    85,000.58/128,006.89 = 74,039.66/x
  3. Step 3: Cross multiply
    85,000.58x = 128,006.89 × 74,039.66
  4. Step 4: Simplify right side
    85,000.58x = 9,477,586,613.26
  5. Step 5: Solve for x
    x = 9,477,586,613.26/85,000.58
  6. Step 6: Final answer
    x = 111,500.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.