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Finding the Fourth Proportional to 47,720.40, 71,580.60 and 12,663.60

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Solution

The fourth proportional to 47,720.40, 71,580.60 and 12,663.60 is: 18,995.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    47,720.40 : 71,580.60 = 12,663.60 : x
  2. Step 2: Convert to fraction form
    47,720.40/71,580.60 = 12,663.60/x
  3. Step 3: Cross multiply
    47,720.40x = 71,580.60 × 12,663.60
  4. Step 4: Simplify right side
    47,720.40x = 906,468,086.16
  5. Step 5: Solve for x
    x = 906,468,086.16/47,720.40
  6. Step 6: Final answer
    x = 18,995.40

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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.