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Finding the Fourth Proportional to 100,355.58, 138,528.63 and 86,151.42

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Solution

The fourth proportional to 100,355.58, 138,528.63 and 86,151.42 is: 118,921.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,355.58 : 138,528.63 = 86,151.42 : x
  2. Step 2: Convert to fraction form
    100,355.58/138,528.63 = 86,151.42/x
  3. Step 3: Cross multiply
    100,355.58x = 138,528.63 × 86,151.42
  4. Step 4: Simplify right side
    100,355.58x = 11,934,438,185.15
  5. Step 5: Solve for x
    x = 11,934,438,185.15/100,355.58
  6. Step 6: Final answer
    x = 118,921.52

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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.