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Finding the Fourth Proportional to 645,909.96, 891,794.70 and 404,290.20

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Solution

The fourth proportional to 645,909.96, 891,794.70 and 404,290.20 is: 558,195.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,909.96 : 891,794.70 = 404,290.20 : x
  2. Step 2: Convert to fraction form
    645,909.96/891,794.70 = 404,290.20/x
  3. Step 3: Cross multiply
    645,909.96x = 891,794.70 × 404,290.20
  4. Step 4: Simplify right side
    645,909.96x = 360,543,857,621.94
  5. Step 5: Solve for x
    x = 360,543,857,621.94/645,909.96
  6. Step 6: Final answer
    x = 558,195.23

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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.