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Finding the Fourth Proportional to 66,399.20, 99,653.20 and 65,880.80

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Solution

The fourth proportional to 66,399.20, 99,653.20 and 65,880.80 is: 98,875.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,399.20 : 99,653.20 = 65,880.80 : x
  2. Step 2: Convert to fraction form
    66,399.20/99,653.20 = 65,880.80/x
  3. Step 3: Cross multiply
    66,399.20x = 99,653.20 × 65,880.80
  4. Step 4: Simplify right side
    66,399.20x = 6,565,232,538.56
  5. Step 5: Solve for x
    x = 6,565,232,538.56/66,399.20
  6. Step 6: Final answer
    x = 98,875.18

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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.