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Finding the Fourth Proportional to 138,126.90, 190,641.30 and 86,468.01

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Solution

The fourth proportional to 138,126.90, 190,641.30 and 86,468.01 is: 119,342.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,126.90 : 190,641.30 = 86,468.01 : x
  2. Step 2: Convert to fraction form
    138,126.90/190,641.30 = 86,468.01/x
  3. Step 3: Cross multiply
    138,126.90x = 190,641.30 × 86,468.01
  4. Step 4: Simplify right side
    138,126.90x = 16,484,372,795.65
  5. Step 5: Solve for x
    x = 16,484,372,795.65/138,126.90
  6. Step 6: Final answer
    x = 119,342.23

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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.