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Finding the Fourth Proportional to 100,653.88, 138,905.46 and 55,335.32

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Solution

The fourth proportional to 100,653.88, 138,905.46 and 55,335.32 is: 76,364.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,653.88 : 138,905.46 = 55,335.32 : x
  2. Step 2: Convert to fraction form
    100,653.88/138,905.46 = 55,335.32/x
  3. Step 3: Cross multiply
    100,653.88x = 138,905.46 × 55,335.32
  4. Step 4: Simplify right side
    100,653.88x = 7,686,378,426.11
  5. Step 5: Solve for x
    x = 7,686,378,426.11/100,653.88
  6. Step 6: Final answer
    x = 76,364.45

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1.5x scale

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.