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Finding the Fourth Proportional to 661,781.21, 990,166.80 and 392,054.15

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Solution

The fourth proportional to 661,781.21, 990,166.80 and 392,054.15 is: 586,597.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,781.21 : 990,166.80 = 392,054.15 : x
  2. Step 2: Convert to fraction form
    661,781.21/990,166.80 = 392,054.15/x
  3. Step 3: Cross multiply
    661,781.21x = 990,166.80 × 392,054.15
  4. Step 4: Simplify right side
    661,781.21x = 388,198,998,181.39
  5. Step 5: Solve for x
    x = 388,198,998,181.39/661,781.21
  6. Step 6: Final answer
    x = 586,597.19

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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.