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Finding the Fourth Proportional to 70,276, 105,248.34 and 60,991.72

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Solution

The fourth proportional to 70,276, 105,248.34 and 60,991.72 is: 91,343.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,276 : 105,248.34 = 60,991.72 : x
  2. Step 2: Convert to fraction form
    70,276/105,248.34 = 60,991.72/x
  3. Step 3: Cross multiply
    70,276x = 105,248.34 × 60,991.72
  4. Step 4: Simplify right side
    70,276x = 6,419,277,283.74
  5. Step 5: Solve for x
    x = 6,419,277,283.74/70,276
  6. Step 6: Final answer
    x = 91,343.81

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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.