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Finding the Fourth Proportional to 407,903.60, 611,855.40 and 218,946.80

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Solution

The fourth proportional to 407,903.60, 611,855.40 and 218,946.80 is: 328,420.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    407,903.60 : 611,855.40 = 218,946.80 : x
  2. Step 2: Convert to fraction form
    407,903.60/611,855.40 = 218,946.80/x
  3. Step 3: Cross multiply
    407,903.60x = 611,855.40 × 218,946.80
  4. Step 4: Simplify right side
    407,903.60x = 133,963,781,892.72
  5. Step 5: Solve for x
    x = 133,963,781,892.72/407,903.60
  6. Step 6: Final answer
    x = 328,420.20

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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.