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Finding the Fourth Proportional to 218,986.70, 328,237.05 and 85,822.70

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Solution

The fourth proportional to 218,986.70, 328,237.05 and 85,822.70 is: 128,638.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,986.70 : 328,237.05 = 85,822.70 : x
  2. Step 2: Convert to fraction form
    218,986.70/328,237.05 = 85,822.70/x
  3. Step 3: Cross multiply
    218,986.70x = 328,237.05 × 85,822.70
  4. Step 4: Simplify right side
    218,986.70x = 28,170,189,871.04
  5. Step 5: Solve for x
    x = 28,170,189,871.04/218,986.70
  6. Step 6: Final answer
    x = 128,638.82

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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.