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Finding the Fourth Proportional to 137,502.72, 189,765.36 and 77,072.40

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Solution

The fourth proportional to 137,502.72, 189,765.36 and 77,072.40 is: 106,366.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,502.72 : 189,765.36 = 77,072.40 : x
  2. Step 2: Convert to fraction form
    137,502.72/189,765.36 = 77,072.40/x
  3. Step 3: Cross multiply
    137,502.72x = 189,765.36 × 77,072.40
  4. Step 4: Simplify right side
    137,502.72x = 14,625,671,732.06
  5. Step 5: Solve for x
    x = 14,625,671,732.06/137,502.72
  6. Step 6: Final answer
    x = 106,366.42

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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.