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Finding the Fourth Proportional to 138,412.66, 207,748.15 and 70,995.31

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Solution

The fourth proportional to 138,412.66, 207,748.15 and 70,995.31 is: 106,559.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,412.66 : 207,748.15 = 70,995.31 : x
  2. Step 2: Convert to fraction form
    138,412.66/207,748.15 = 70,995.31/x
  3. Step 3: Cross multiply
    138,412.66x = 207,748.15 × 70,995.31
  4. Step 4: Simplify right side
    138,412.66x = 14,749,143,614.32
  5. Step 5: Solve for x
    x = 14,749,143,614.32/138,412.66
  6. Step 6: Final answer
    x = 106,559.21

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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.