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Finding the Fourth Proportional to 256,829.60, 385,244.40 and 79,320.80

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Solution

The fourth proportional to 256,829.60, 385,244.40 and 79,320.80 is: 118,981.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,829.60 : 385,244.40 = 79,320.80 : x
  2. Step 2: Convert to fraction form
    256,829.60/385,244.40 = 79,320.80/x
  3. Step 3: Cross multiply
    256,829.60x = 385,244.40 × 79,320.80
  4. Step 4: Simplify right side
    256,829.60x = 30,557,894,003.52
  5. Step 5: Solve for x
    x = 30,557,894,003.52/256,829.60
  6. Step 6: Final answer
    x = 118,981.20

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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.