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Finding the Fourth Proportional to 63,986.80, 95,980.20 and 42,991.60

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Solution

The fourth proportional to 63,986.80, 95,980.20 and 42,991.60 is: 64,487.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    63,986.80 : 95,980.20 = 42,991.60 : x
  2. Step 2: Convert to fraction form
    63,986.80/95,980.20 = 42,991.60/x
  3. Step 3: Cross multiply
    63,986.80x = 95,980.20 × 42,991.60
  4. Step 4: Simplify right side
    63,986.80x = 4,126,342,366.32
  5. Step 5: Solve for x
    x = 4,126,342,366.32/63,986.80
  6. Step 6: Final answer
    x = 64,487.40

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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.