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Finding the Fourth Proportional to 718,020.60, 990,828 and 395,729.72

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Solution

The fourth proportional to 718,020.60, 990,828 and 395,729.72 is: 546,084.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,020.60 : 990,828 = 395,729.72 : x
  2. Step 2: Convert to fraction form
    718,020.60/990,828 = 395,729.72/x
  3. Step 3: Cross multiply
    718,020.60x = 990,828 × 395,729.72
  4. Step 4: Simplify right side
    718,020.60x = 392,100,087,008.16
  5. Step 5: Solve for x
    x = 392,100,087,008.16/718,020.60
  6. Step 6: Final answer
    x = 546,084.73

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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.