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Finding the Fourth Proportional to 218,793.36, 302,035.64 and 128,136.72

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Solution

The fourth proportional to 218,793.36, 302,035.64 and 128,136.72 is: 176,887.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,793.36 : 302,035.64 = 128,136.72 : x
  2. Step 2: Convert to fraction form
    218,793.36/302,035.64 = 128,136.72/x
  3. Step 3: Cross multiply
    218,793.36x = 302,035.64 × 128,136.72
  4. Step 4: Simplify right side
    218,793.36x = 38,701,855,592.02
  5. Step 5: Solve for x
    x = 38,701,855,592.02/218,793.36
  6. Step 6: Final answer
    x = 176,887.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.