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Finding the Fourth Proportional to 91,213.79, 136,820.68 and 66,411.67

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Solution

The fourth proportional to 91,213.79, 136,820.68 and 66,411.67 is: 99,617.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,213.79 : 136,820.68 = 66,411.67 : x
  2. Step 2: Convert to fraction form
    91,213.79/136,820.68 = 66,411.67/x
  3. Step 3: Cross multiply
    91,213.79x = 136,820.68 × 66,411.67
  4. Step 4: Simplify right side
    91,213.79x = 9,086,490,472.91
  5. Step 5: Solve for x
    x = 9,086,490,472.91/91,213.79
  6. Step 6: Final answer
    x = 99,617.51

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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.