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Finding the Fourth Proportional to 445,892.80, 668,839.20 and 209,259.40

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Solution

The fourth proportional to 445,892.80, 668,839.20 and 209,259.40 is: 313,889.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    445,892.80 : 668,839.20 = 209,259.40 : x
  2. Step 2: Convert to fraction form
    445,892.80/668,839.20 = 209,259.40/x
  3. Step 3: Cross multiply
    445,892.80x = 668,839.20 × 209,259.40
  4. Step 4: Simplify right side
    445,892.80x = 139,960,889,688.48
  5. Step 5: Solve for x
    x = 139,960,889,688.48/445,892.80
  6. Step 6: Final answer
    x = 313,889.10

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Similar ratio
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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.