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Finding the Fourth Proportional to 661,803.18, 990,199.68 and 392,076.12

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Solution

The fourth proportional to 661,803.18, 990,199.68 and 392,076.12 is: 586,630.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,803.18 : 990,199.68 = 392,076.12 : x
  2. Step 2: Convert to fraction form
    661,803.18/990,199.68 = 392,076.12/x
  3. Step 3: Cross multiply
    661,803.18x = 990,199.68 × 392,076.12
  4. Step 4: Simplify right side
    661,803.18x = 388,233,651,035.14
  5. Step 5: Solve for x
    x = 388,233,651,035.14/661,803.18
  6. Step 6: Final answer
    x = 586,630.08

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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.