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Finding the Fourth Proportional to 718,105.84, 990,992.66 and 395,828.30

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Solution

The fourth proportional to 718,105.84, 990,992.66 and 395,828.30 is: 546,246.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,105.84 : 990,992.66 = 395,828.30 : x
  2. Step 2: Convert to fraction form
    718,105.84/990,992.66 = 395,828.30/x
  3. Step 3: Cross multiply
    718,105.84x = 990,992.66 × 395,828.30
  4. Step 4: Simplify right side
    718,105.84x = 392,262,939,920.28
  5. Step 5: Solve for x
    x = 392,262,939,920.28/718,105.84
  6. Step 6: Final answer
    x = 546,246.69

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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.