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Finding the Fourth Proportional to 70,608.92, 105,881.06 and 42,158.78

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Solution

The fourth proportional to 70,608.92, 105,881.06 and 42,158.78 is: 63,218.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,608.92 : 105,881.06 = 42,158.78 : x
  2. Step 2: Convert to fraction form
    70,608.92/105,881.06 = 42,158.78/x
  3. Step 3: Cross multiply
    70,608.92x = 105,881.06 × 42,158.78
  4. Step 4: Simplify right side
    70,608.92x = 4,463,815,574.51
  5. Step 5: Solve for x
    x = 4,463,815,574.51/70,608.92
  6. Step 6: Final answer
    x = 63,218.87

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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.