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Finding the Fourth Proportional to 491,999.49, 678,990.47 and 285,310.17

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Solution

The fourth proportional to 491,999.49, 678,990.47 and 285,310.17 is: 393,746.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,999.49 : 678,990.47 = 285,310.17 : x
  2. Step 2: Convert to fraction form
    491,999.49/678,990.47 = 285,310.17/x
  3. Step 3: Cross multiply
    491,999.49x = 678,990.47 × 285,310.17
  4. Step 4: Simplify right side
    491,999.49x = 193,722,884,997.53
  5. Step 5: Solve for x
    x = 193,722,884,997.53/491,999.49
  6. Step 6: Final answer
    x = 393,746.11

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1.5x scale

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.