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Finding the Fourth Proportional to 138,655.61, 191,344.59 and 74,993.25

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Solution

The fourth proportional to 138,655.61, 191,344.59 and 74,993.25 is: 103,490.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,655.61 : 191,344.59 = 74,993.25 : x
  2. Step 2: Convert to fraction form
    138,655.61/191,344.59 = 74,993.25/x
  3. Step 3: Cross multiply
    138,655.61x = 191,344.59 × 74,993.25
  4. Step 4: Simplify right side
    138,655.61x = 14,349,552,674.02
  5. Step 5: Solve for x
    x = 14,349,552,674.02/138,655.61
  6. Step 6: Final answer
    x = 103,490.61

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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.