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Finding the Fourth Proportional to 100,666.98, 138,989.31 and 92,136.39

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Solution

The fourth proportional to 100,666.98, 138,989.31 and 92,136.39 is: 127,211.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,666.98 : 138,989.31 = 92,136.39 : x
  2. Step 2: Convert to fraction form
    100,666.98/138,989.31 = 92,136.39/x
  3. Step 3: Cross multiply
    100,666.98x = 138,989.31 × 92,136.39
  4. Step 4: Simplify right side
    100,666.98x = 12,805,973,271.99
  5. Step 5: Solve for x
    x = 12,805,973,271.99/100,666.98
  6. Step 6: Final answer
    x = 127,211.26

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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.