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Finding the Fourth Proportional to 611,384.60, 917,076.90 and 387,435.80

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Solution

The fourth proportional to 611,384.60, 917,076.90 and 387,435.80 is: 581,153.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,384.60 : 917,076.90 = 387,435.80 : x
  2. Step 2: Convert to fraction form
    611,384.60/917,076.90 = 387,435.80/x
  3. Step 3: Cross multiply
    611,384.60x = 917,076.90 × 387,435.80
  4. Step 4: Simplify right side
    611,384.60x = 355,308,422,413.02
  5. Step 5: Solve for x
    x = 355,308,422,413.02/611,384.60
  6. Step 6: Final answer
    x = 581,153.70

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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.