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Finding the Fourth Proportional to 218,814.80, 328,222.20 and 78,587.60

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Solution

The fourth proportional to 218,814.80, 328,222.20 and 78,587.60 is: 117,881.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,814.80 : 328,222.20 = 78,587.60 : x
  2. Step 2: Convert to fraction form
    218,814.80/328,222.20 = 78,587.60/x
  3. Step 3: Cross multiply
    218,814.80x = 328,222.20 × 78,587.60
  4. Step 4: Simplify right side
    218,814.80x = 25,794,194,964.72
  5. Step 5: Solve for x
    x = 25,794,194,964.72/218,814.80
  6. Step 6: Final answer
    x = 117,881.40

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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.