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Finding the Fourth Proportional to 66,928.80, 100,393.20 and 56,431.20

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Solution

The fourth proportional to 66,928.80, 100,393.20 and 56,431.20 is: 84,646.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,928.80 : 100,393.20 = 56,431.20 : x
  2. Step 2: Convert to fraction form
    66,928.80/100,393.20 = 56,431.20/x
  3. Step 3: Cross multiply
    66,928.80x = 100,393.20 × 56,431.20
  4. Step 4: Simplify right side
    66,928.80x = 5,665,308,747.84
  5. Step 5: Solve for x
    x = 5,665,308,747.84/66,928.80
  6. Step 6: Final answer
    x = 84,646.80

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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.