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Finding the Fourth Proportional to 139,272.33, 209,056.10 and 86,718.81

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Solution

The fourth proportional to 139,272.33, 209,056.10 and 86,718.81 is: 130,170.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,272.33 : 209,056.10 = 86,718.81 : x
  2. Step 2: Convert to fraction form
    139,272.33/209,056.10 = 86,718.81/x
  3. Step 3: Cross multiply
    139,272.33x = 209,056.10 × 86,718.81
  4. Step 4: Simplify right side
    139,272.33x = 18,129,095,781.65
  5. Step 5: Solve for x
    x = 18,129,095,781.65/139,272.33
  6. Step 6: Final answer
    x = 130,170.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.