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Finding the Fourth Proportional to 282,990, 424,487.88 and 85,998

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Solution

The fourth proportional to 282,990, 424,487.88 and 85,998 is: 128,997.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    282,990 : 424,487.88 = 85,998 : x
  2. Step 2: Convert to fraction form
    282,990/424,487.88 = 85,998/x
  3. Step 3: Cross multiply
    282,990x = 424,487.88 × 85,998
  4. Step 4: Simplify right side
    282,990x = 36,505,108,704.24
  5. Step 5: Solve for x
    x = 36,505,108,704.24/282,990
  6. Step 6: Final answer
    x = 128,997.88

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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.