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Finding the Fourth Proportional to 138,689.48, 191,390.83 and 75,026.72

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Solution

The fourth proportional to 138,689.48, 191,390.83 and 75,026.72 is: 103,536.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,689.48 : 191,390.83 = 75,026.72 : x
  2. Step 2: Convert to fraction form
    138,689.48/191,390.83 = 75,026.72/x
  3. Step 3: Cross multiply
    138,689.48x = 191,390.83 × 75,026.72
  4. Step 4: Simplify right side
    138,689.48x = 14,359,425,068.46
  5. Step 5: Solve for x
    x = 14,359,425,068.46/138,689.48
  6. Step 6: Final answer
    x = 103,536.52

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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.