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Finding the Fourth Proportional to 70,515.47, 105,673.75 and 38,939.75

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Solution

The fourth proportional to 70,515.47, 105,673.75 and 38,939.75 is: 58,354.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,515.47 : 105,673.75 = 38,939.75 : x
  2. Step 2: Convert to fraction form
    70,515.47/105,673.75 = 38,939.75/x
  3. Step 3: Cross multiply
    70,515.47x = 105,673.75 × 38,939.75
  4. Step 4: Simplify right side
    70,515.47x = 4,114,909,406.56
  5. Step 5: Solve for x
    x = 4,114,909,406.56/70,515.47
  6. Step 6: Final answer
    x = 58,354.70

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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.