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Finding the Fourth Proportional to 66,000.40, 99,000.60 and 42,380.80

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Solution

The fourth proportional to 66,000.40, 99,000.60 and 42,380.80 is: 63,571.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,000.40 : 99,000.60 = 42,380.80 : x
  2. Step 2: Convert to fraction form
    66,000.40/99,000.60 = 42,380.80/x
  3. Step 3: Cross multiply
    66,000.40x = 99,000.60 × 42,380.80
  4. Step 4: Simplify right side
    66,000.40x = 4,195,724,628.48
  5. Step 5: Solve for x
    x = 4,195,724,628.48/66,000.40
  6. Step 6: Final answer
    x = 63,571.20

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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.