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Finding the Fourth Proportional to 218,686.40, 328,029.60 and 60,939.20

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Solution

The fourth proportional to 218,686.40, 328,029.60 and 60,939.20 is: 91,408.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,686.40 : 328,029.60 = 60,939.20 : x
  2. Step 2: Convert to fraction form
    218,686.40/328,029.60 = 60,939.20/x
  3. Step 3: Cross multiply
    218,686.40x = 328,029.60 × 60,939.20
  4. Step 4: Simplify right side
    218,686.40x = 19,989,861,400.32
  5. Step 5: Solve for x
    x = 19,989,861,400.32/218,686.40
  6. Step 6: Final answer
    x = 91,408.80

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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.