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Finding the Fourth Proportional to 645,687.70, 890,808.22 and 403,878.40

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Solution

The fourth proportional to 645,687.70, 890,808.22 and 403,878.40 is: 557,201.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,687.70 : 890,808.22 = 403,878.40 : x
  2. Step 2: Convert to fraction form
    645,687.70/890,808.22 = 403,878.40/x
  3. Step 3: Cross multiply
    645,687.70x = 890,808.22 × 403,878.40
  4. Step 4: Simplify right side
    645,687.70x = 359,778,198,600.45
  5. Step 5: Solve for x
    x = 359,778,198,600.45/645,687.70
  6. Step 6: Final answer
    x = 557,201.57

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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.