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Finding the Fourth Proportional to 427,207.20, 640,810.80 and 371,911.20

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Solution

The fourth proportional to 427,207.20, 640,810.80 and 371,911.20 is: 557,866.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,207.20 : 640,810.80 = 371,911.20 : x
  2. Step 2: Convert to fraction form
    427,207.20/640,810.80 = 371,911.20/x
  3. Step 3: Cross multiply
    427,207.20x = 640,810.80 × 371,911.20
  4. Step 4: Simplify right side
    427,207.20x = 238,324,713,600.96
  5. Step 5: Solve for x
    x = 238,324,713,600.96/427,207.20
  6. Step 6: Final answer
    x = 557,866.80

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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.