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Finding the Fourth Proportional to 100,347.72, 138,573.63 and 64,599.90

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Solution

The fourth proportional to 100,347.72, 138,573.63 and 64,599.90 is: 89,208.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,347.72 : 138,573.63 = 64,599.90 : x
  2. Step 2: Convert to fraction form
    100,347.72/138,573.63 = 64,599.90/x
  3. Step 3: Cross multiply
    100,347.72x = 138,573.63 × 64,599.90
  4. Step 4: Simplify right side
    100,347.72x = 8,951,842,640.64
  5. Step 5: Solve for x
    x = 8,951,842,640.64/100,347.72
  6. Step 6: Final answer
    x = 89,208.23

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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.