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Finding the Fourth Proportional to 640,779.89, 884,240.91 and 354,281.06

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Solution

The fourth proportional to 640,779.89, 884,240.91 and 354,281.06 is: 488,888.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,779.89 : 884,240.91 = 354,281.06 : x
  2. Step 2: Convert to fraction form
    640,779.89/884,240.91 = 354,281.06/x
  3. Step 3: Cross multiply
    640,779.89x = 884,240.91 × 354,281.06
  4. Step 4: Simplify right side
    640,779.89x = 313,269,809,100.77
  5. Step 5: Solve for x
    x = 313,269,809,100.77/640,779.89
  6. Step 6: Final answer
    x = 488,888.33

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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.