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Finding the Fourth Proportional to 218,955.80, 328,618.24 and 85,929.48

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Solution

The fourth proportional to 218,955.80, 328,618.24 and 85,929.48 is: 128,966.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,955.80 : 328,618.24 = 85,929.48 : x
  2. Step 2: Convert to fraction form
    218,955.80/328,618.24 = 85,929.48/x
  3. Step 3: Cross multiply
    218,955.80x = 328,618.24 × 85,929.48
  4. Step 4: Simplify right side
    218,955.80x = 28,237,994,266.89
  5. Step 5: Solve for x
    x = 28,237,994,266.89/218,955.80
  6. Step 6: Final answer
    x = 128,966.64

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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.