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Finding the Fourth Proportional to 136,988.51, 189,040.46 and 76,559.63

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Solution

The fourth proportional to 136,988.51, 189,040.46 and 76,559.63 is: 105,650.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,988.51 : 189,040.46 = 76,559.63 : x
  2. Step 2: Convert to fraction form
    136,988.51/189,040.46 = 76,559.63/x
  3. Step 3: Cross multiply
    136,988.51x = 189,040.46 × 76,559.63
  4. Step 4: Simplify right side
    136,988.51x = 14,472,866,344.63
  5. Step 5: Solve for x
    x = 14,472,866,344.63/136,988.51
  6. Step 6: Final answer
    x = 105,650.22

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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.