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Finding the Fourth Proportional to 218,922.80, 328,384.20 and 78,695.60

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Solution

The fourth proportional to 218,922.80, 328,384.20 and 78,695.60 is: 118,043.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,922.80 : 328,384.20 = 78,695.60 : x
  2. Step 2: Convert to fraction form
    218,922.80/328,384.20 = 78,695.60/x
  3. Step 3: Cross multiply
    218,922.80x = 328,384.20 × 78,695.60
  4. Step 4: Simplify right side
    218,922.80x = 25,842,391,649.52
  5. Step 5: Solve for x
    x = 25,842,391,649.52/218,922.80
  6. Step 6: Final answer
    x = 118,043.40

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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.