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Finding the Fourth Proportional to 100,530.46, 138,655.16 and 68,289.94

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Solution

The fourth proportional to 100,530.46, 138,655.16 and 68,289.94 is: 94,187.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,530.46 : 138,655.16 = 68,289.94 : x
  2. Step 2: Convert to fraction form
    100,530.46/138,655.16 = 68,289.94/x
  3. Step 3: Cross multiply
    100,530.46x = 138,655.16 × 68,289.94
  4. Step 4: Simplify right side
    100,530.46x = 9,468,751,522.36
  5. Step 5: Solve for x
    x = 9,468,751,522.36/100,530.46
  6. Step 6: Final answer
    x = 94,187.89

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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.