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Finding the Fourth Proportional to 85,499.90, 128,055.45 and 54,007.10

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Solution

The fourth proportional to 85,499.90, 128,055.45 and 54,007.10 is: 80,887.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,499.90 : 128,055.45 = 54,007.10 : x
  2. Step 2: Convert to fraction form
    85,499.90/128,055.45 = 54,007.10/x
  3. Step 3: Cross multiply
    85,499.90x = 128,055.45 × 54,007.10
  4. Step 4: Simplify right side
    85,499.90x = 6,915,903,493.70
  5. Step 5: Solve for x
    x = 6,915,903,493.70/85,499.90
  6. Step 6: Final answer
    x = 80,887.85

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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.