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Finding the Fourth Proportional to 85,478.91, 128,103.75 and 66,526.43

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Solution

The fourth proportional to 85,478.91, 128,103.75 and 66,526.43 is: 99,700.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,478.91 : 128,103.75 = 66,526.43 : x
  2. Step 2: Convert to fraction form
    85,478.91/128,103.75 = 66,526.43/x
  3. Step 3: Cross multiply
    85,478.91x = 128,103.75 × 66,526.43
  4. Step 4: Simplify right side
    85,478.91x = 8,522,285,121.72
  5. Step 5: Solve for x
    x = 8,522,285,121.72/85,478.91
  6. Step 6: Final answer
    x = 99,700.44

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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.