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Finding the Fourth Proportional to 718,103.84, 990,989.88 and 395,826.28

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Solution

The fourth proportional to 718,103.84, 990,989.88 and 395,826.28 is: 546,243.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,103.84 : 990,989.88 = 395,826.28 : x
  2. Step 2: Convert to fraction form
    718,103.84/990,989.88 = 395,826.28/x
  3. Step 3: Cross multiply
    718,103.84x = 990,989.88 × 395,826.28
  4. Step 4: Simplify right side
    718,103.84x = 392,259,837,718.05
  5. Step 5: Solve for x
    x = 392,259,837,718.05/718,103.84
  6. Step 6: Final answer
    x = 546,243.89

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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.