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Finding the Fourth Proportional to 645,685.70, 890,805.47 and 403,876.40

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Solution

The fourth proportional to 645,685.70, 890,805.47 and 403,876.40 is: 557,198.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,685.70 : 890,805.47 = 403,876.40 : x
  2. Step 2: Convert to fraction form
    645,685.70/890,805.47 = 403,876.40/x
  3. Step 3: Cross multiply
    645,685.70x = 890,805.47 × 403,876.40
  4. Step 4: Simplify right side
    645,685.70x = 359,775,299,850.50
  5. Step 5: Solve for x
    x = 359,775,299,850.50/645,685.70
  6. Step 6: Final answer
    x = 557,198.81

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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.