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Finding the Fourth Proportional to 718,138.50, 991,075.46 and 395,847.87

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Solution

The fourth proportional to 718,138.50, 991,075.46 and 395,847.87 is: 546,294.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,138.50 : 991,075.46 = 395,847.87 : x
  2. Step 2: Convert to fraction form
    718,138.50/991,075.46 = 395,847.87/x
  3. Step 3: Cross multiply
    718,138.50x = 991,075.46 × 395,847.87
  4. Step 4: Simplify right side
    718,138.50x = 392,315,109,850.27
  5. Step 5: Solve for x
    x = 392,315,109,850.27/718,138.50
  6. Step 6: Final answer
    x = 546,294.50

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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.