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Finding the Fourth Proportional to 119,886.49, 165,341.78 and 72,130.91

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Solution

The fourth proportional to 119,886.49, 165,341.78 and 72,130.91 is: 99,479.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    119,886.49 : 165,341.78 = 72,130.91 : x
  2. Step 2: Convert to fraction form
    119,886.49/165,341.78 = 72,130.91/x
  3. Step 3: Cross multiply
    119,886.49x = 165,341.78 × 72,130.91
  4. Step 4: Simplify right side
    119,886.49x = 11,926,253,105.12
  5. Step 5: Solve for x
    x = 11,926,253,105.12/119,886.49
  6. Step 6: Final answer
    x = 99,479.54

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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.