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Finding the Fourth Proportional to 103,549.88, 155,126.93 and 86,790.17

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Solution

The fourth proportional to 103,549.88, 155,126.93 and 86,790.17 is: 130,019.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,549.88 : 155,126.93 = 86,790.17 : x
  2. Step 2: Convert to fraction form
    103,549.88/155,126.93 = 86,790.17/x
  3. Step 3: Cross multiply
    103,549.88x = 155,126.93 × 86,790.17
  4. Step 4: Simplify right side
    103,549.88x = 13,463,491,416.69
  5. Step 5: Solve for x
    x = 13,463,491,416.69/103,549.88
  6. Step 6: Final answer
    x = 130,019.39

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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.