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Finding the Fourth Proportional to 76,043.28, 114,064.80 and 20,639.28

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Solution

The fourth proportional to 76,043.28, 114,064.80 and 20,639.28 is: 30,958.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,043.28 : 114,064.80 = 20,639.28 : x
  2. Step 2: Convert to fraction form
    76,043.28/114,064.80 = 20,639.28/x
  3. Step 3: Cross multiply
    76,043.28x = 114,064.80 × 20,639.28
  4. Step 4: Simplify right side
    76,043.28x = 2,354,215,345.34
  5. Step 5: Solve for x
    x = 2,354,215,345.34/76,043.28
  6. Step 6: Final answer
    x = 30,958.89

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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.