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Finding the Fourth Proportional to 91,019.70, 136,529.55 and 85,114.80

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Solution

The fourth proportional to 91,019.70, 136,529.55 and 85,114.80 is: 127,672.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,019.70 : 136,529.55 = 85,114.80 : x
  2. Step 2: Convert to fraction form
    91,019.70/136,529.55 = 85,114.80/x
  3. Step 3: Cross multiply
    91,019.70x = 136,529.55 × 85,114.80
  4. Step 4: Simplify right side
    91,019.70x = 11,620,685,342.34
  5. Step 5: Solve for x
    x = 11,620,685,342.34/91,019.70
  6. Step 6: Final answer
    x = 127,672.20

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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.