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Finding the Fourth Proportional to 138,718.66, 191,430.39 and 75,055.06

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Solution

The fourth proportional to 138,718.66, 191,430.39 and 75,055.06 is: 103,575.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,718.66 : 191,430.39 = 75,055.06 : x
  2. Step 2: Convert to fraction form
    138,718.66/191,430.39 = 75,055.06/x
  3. Step 3: Cross multiply
    138,718.66x = 191,430.39 × 75,055.06
  4. Step 4: Simplify right side
    138,718.66x = 14,367,819,407.27
  5. Step 5: Solve for x
    x = 14,367,819,407.27/138,718.66
  6. Step 6: Final answer
    x = 103,575.25

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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.