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Finding the Fourth Proportional to 85,783.89, 128,724.18 and 67,011.27

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Solution

The fourth proportional to 85,783.89, 128,724.18 and 67,011.27 is: 100,554.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,783.89 : 128,724.18 = 67,011.27 : x
  2. Step 2: Convert to fraction form
    85,783.89/128,724.18 = 67,011.27/x
  3. Step 3: Cross multiply
    85,783.89x = 128,724.18 × 67,011.27
  4. Step 4: Simplify right side
    85,783.89x = 8,625,970,781.51
  5. Step 5: Solve for x
    x = 8,625,970,781.51/85,783.89
  6. Step 6: Final answer
    x = 100,554.67

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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.