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Finding the Fourth Proportional to 445,109.76, 613,916.40 and 309,143.88

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Solution

The fourth proportional to 445,109.76, 613,916.40 and 309,143.88 is: 426,385.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    445,109.76 : 613,916.40 = 309,143.88 : x
  2. Step 2: Convert to fraction form
    445,109.76/613,916.40 = 309,143.88/x
  3. Step 3: Cross multiply
    445,109.76x = 613,916.40 × 309,143.88
  4. Step 4: Simplify right side
    445,109.76x = 189,788,497,891.63
  5. Step 5: Solve for x
    x = 189,788,497,891.63/445,109.76
  6. Step 6: Final answer
    x = 426,385.84

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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.