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Finding the Fourth Proportional to 138,988.64, 191,804.66 and 75,326.42

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Solution

The fourth proportional to 138,988.64, 191,804.66 and 75,326.42 is: 103,950.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,988.64 : 191,804.66 = 75,326.42 : x
  2. Step 2: Convert to fraction form
    138,988.64/191,804.66 = 75,326.42/x
  3. Step 3: Cross multiply
    138,988.64x = 191,804.66 × 75,326.42
  4. Step 4: Simplify right side
    138,988.64x = 14,447,958,762.47
  5. Step 5: Solve for x
    x = 14,447,958,762.47/138,988.64
  6. Step 6: Final answer
    x = 103,950.64

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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.