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Finding the Fourth Proportional to 85,486.70, 128,230.05 and 84,320.30

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Solution

The fourth proportional to 85,486.70, 128,230.05 and 84,320.30 is: 126,480.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,486.70 : 128,230.05 = 84,320.30 : x
  2. Step 2: Convert to fraction form
    85,486.70/128,230.05 = 84,320.30/x
  3. Step 3: Cross multiply
    85,486.70x = 128,230.05 × 84,320.30
  4. Step 4: Simplify right side
    85,486.70x = 10,812,396,285.02
  5. Step 5: Solve for x
    x = 10,812,396,285.02/85,486.70
  6. Step 6: Final answer
    x = 126,480.45

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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.