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Finding the Fourth Proportional to 138,674.64, 191,365.56 and 78,235.68

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Solution

The fourth proportional to 138,674.64, 191,365.56 and 78,235.68 is: 107,962.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,674.64 : 191,365.56 = 78,235.68 : x
  2. Step 2: Convert to fraction form
    138,674.64/191,365.56 = 78,235.68/x
  3. Step 3: Cross multiply
    138,674.64x = 191,365.56 × 78,235.68
  4. Step 4: Simplify right side
    138,674.64x = 14,971,614,715.18
  5. Step 5: Solve for x
    x = 14,971,614,715.18/138,674.64
  6. Step 6: Final answer
    x = 107,962.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.