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Finding the Fourth Proportional to 715,828, 987,817.46 and 393,535.76

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Solution

The fourth proportional to 715,828, 987,817.46 and 393,535.76 is: 543,065.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,828 : 987,817.46 = 393,535.76 : x
  2. Step 2: Convert to fraction form
    715,828/987,817.46 = 393,535.76/x
  3. Step 3: Cross multiply
    715,828x = 987,817.46 × 393,535.76
  4. Step 4: Simplify right side
    715,828x = 388,741,494,862.37
  5. Step 5: Solve for x
    x = 388,741,494,862.37/715,828
  6. Step 6: Final answer
    x = 543,065.51

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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.