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Finding the Fourth Proportional to 613,779.90, 919,114.65 and 489,363.90

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Solution

The fourth proportional to 613,779.90, 919,114.65 and 489,363.90 is: 732,805.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    613,779.90 : 919,114.65 = 489,363.90 : x
  2. Step 2: Convert to fraction form
    613,779.90/919,114.65 = 489,363.90/x
  3. Step 3: Cross multiply
    613,779.90x = 919,114.65 × 489,363.90
  4. Step 4: Simplify right side
    613,779.90x = 449,781,529,671.14
  5. Step 5: Solve for x
    x = 449,781,529,671.14/613,779.90
  6. Step 6: Final answer
    x = 732,805.90

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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.