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Finding the Fourth Proportional to 138,653.53, 191,458.53 and 87,756.08

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Solution

The fourth proportional to 138,653.53, 191,458.53 and 87,756.08 is: 121,177.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,653.53 : 191,458.53 = 87,756.08 : x
  2. Step 2: Convert to fraction form
    138,653.53/191,458.53 = 87,756.08/x
  3. Step 3: Cross multiply
    138,653.53x = 191,458.53 × 87,756.08
  4. Step 4: Simplify right side
    138,653.53x = 16,801,649,118.07
  5. Step 5: Solve for x
    x = 16,801,649,118.07/138,653.53
  6. Step 6: Final answer
    x = 121,177.22

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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.