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Finding the Fourth Proportional to 218,838.45, 328,126.28 and 85,559.79

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Solution

The fourth proportional to 218,838.45, 328,126.28 and 85,559.79 is: 128,288.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,838.45 : 328,126.28 = 85,559.79 : x
  2. Step 2: Convert to fraction form
    218,838.45/328,126.28 = 85,559.79/x
  3. Step 3: Cross multiply
    218,838.45x = 328,126.28 × 85,559.79
  4. Step 4: Simplify right side
    218,838.45x = 28,074,415,182.48
  5. Step 5: Solve for x
    x = 28,074,415,182.48/218,838.45
  6. Step 6: Final answer
    x = 128,288.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.