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Finding the Fourth Proportional to 100,869.69, 139,207.58 and 72,192.05

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Solution

The fourth proportional to 100,869.69, 139,207.58 and 72,192.05 is: 99,630.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,869.69 : 139,207.58 = 72,192.05 : x
  2. Step 2: Convert to fraction form
    100,869.69/139,207.58 = 72,192.05/x
  3. Step 3: Cross multiply
    100,869.69x = 139,207.58 × 72,192.05
  4. Step 4: Simplify right side
    100,869.69x = 10,049,680,575.74
  5. Step 5: Solve for x
    x = 10,049,680,575.74/100,869.69
  6. Step 6: Final answer
    x = 99,630.33

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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.