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Finding the Fourth Proportional to 100,751.15, 139,036.57 and 55,428.15

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Solution

The fourth proportional to 100,751.15, 139,036.57 and 55,428.15 is: 76,490.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,751.15 : 139,036.57 = 55,428.15 : x
  2. Step 2: Convert to fraction form
    100,751.15/139,036.57 = 55,428.15/x
  3. Step 3: Cross multiply
    100,751.15x = 139,036.57 × 55,428.15
  4. Step 4: Simplify right side
    100,751.15x = 7,706,539,857.45
  5. Step 5: Solve for x
    x = 7,706,539,857.45/100,751.15
  6. Step 6: Final answer
    x = 76,490.84

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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.