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Finding the Fourth Proportional to 100,780.65, 139,074.35 and 55,458.62

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Solution

The fourth proportional to 100,780.65, 139,074.35 and 55,458.62 is: 76,531.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,780.65 : 139,074.35 = 55,458.62 : x
  2. Step 2: Convert to fraction form
    100,780.65/139,074.35 = 55,458.62/x
  3. Step 3: Cross multiply
    100,780.65x = 139,074.35 × 55,458.62
  4. Step 4: Simplify right side
    100,780.65x = 7,712,870,971.67
  5. Step 5: Solve for x
    x = 7,712,870,971.67/100,780.65
  6. Step 6: Final answer
    x = 76,531.27

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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.