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Finding the Fourth Proportional to 489,980.58, 676,169.91 and 308,809.50

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Solution

The fourth proportional to 489,980.58, 676,169.91 and 308,809.50 is: 426,155.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,980.58 : 676,169.91 = 308,809.50 : x
  2. Step 2: Convert to fraction form
    489,980.58/676,169.91 = 308,809.50/x
  3. Step 3: Cross multiply
    489,980.58x = 676,169.91 × 308,809.50
  4. Step 4: Simplify right side
    489,980.58x = 208,807,691,822.15
  5. Step 5: Solve for x
    x = 208,807,691,822.15/489,980.58
  6. Step 6: Final answer
    x = 426,155.04

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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.