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Finding the Fourth Proportional to 256,605.20, 384,916.60 and 79,110.80

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Solution

The fourth proportional to 256,605.20, 384,916.60 and 79,110.80 is: 118,668.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,605.20 : 384,916.60 = 79,110.80 : x
  2. Step 2: Convert to fraction form
    256,605.20/384,916.60 = 79,110.80/x
  3. Step 3: Cross multiply
    256,605.20x = 384,916.60 × 79,110.80
  4. Step 4: Simplify right side
    256,605.20x = 30,451,060,159.28
  5. Step 5: Solve for x
    x = 30,451,060,159.28/256,605.20
  6. Step 6: Final answer
    x = 118,668.91

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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.