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Finding the Fourth Proportional to 218,955.76, 328,193.71 and 85,689.55

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Solution

The fourth proportional to 218,955.76, 328,193.71 and 85,689.55 is: 128,440.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,955.76 : 328,193.71 = 85,689.55 : x
  2. Step 2: Convert to fraction form
    218,955.76/328,193.71 = 85,689.55/x
  3. Step 3: Cross multiply
    218,955.76x = 328,193.71 × 85,689.55
  4. Step 4: Simplify right side
    218,955.76x = 28,122,771,322.73
  5. Step 5: Solve for x
    x = 28,122,771,322.73/218,955.76
  6. Step 6: Final answer
    x = 128,440.43

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1.5x scale

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.