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Finding the Fourth Proportional to 154,901.69, 213,764.44 and 86,909.28

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Solution

The fourth proportional to 154,901.69, 213,764.44 and 86,909.28 is: 119,934.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,901.69 : 213,764.44 = 86,909.28 : x
  2. Step 2: Convert to fraction form
    154,901.69/213,764.44 = 86,909.28/x
  3. Step 3: Cross multiply
    154,901.69x = 213,764.44 × 86,909.28
  4. Step 4: Simplify right side
    154,901.69x = 18,578,113,570.00
  5. Step 5: Solve for x
    x = 18,578,113,570.00/154,901.69
  6. Step 6: Final answer
    x = 119,934.87

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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.