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Finding the Fourth Proportional to 717,758.26, 990,507.36 and 391,069.60

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Solution

The fourth proportional to 717,758.26, 990,507.36 and 391,069.60 is: 539,676.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,758.26 : 990,507.36 = 391,069.60 : x
  2. Step 2: Convert to fraction form
    717,758.26/990,507.36 = 391,069.60/x
  3. Step 3: Cross multiply
    717,758.26x = 990,507.36 × 391,069.60
  4. Step 4: Simplify right side
    717,758.26x = 387,357,317,072.26
  5. Step 5: Solve for x
    x = 387,357,317,072.26/717,758.26
  6. Step 6: Final answer
    x = 539,676.57

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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.