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Finding the Fourth Proportional to 163,345.32, 225,441 and 99,720

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Solution

The fourth proportional to 163,345.32, 225,441 and 99,720 is: 137,628.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    163,345.32 : 225,441 = 99,720 : x
  2. Step 2: Convert to fraction form
    163,345.32/225,441 = 99,720/x
  3. Step 3: Cross multiply
    163,345.32x = 225,441 × 99,720
  4. Step 4: Simplify right side
    163,345.32x = 22,480,976,520
  5. Step 5: Solve for x
    x = 22,480,976,520/163,345.32
  6. Step 6: Final answer
    x = 137,628.53

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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.