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Finding the Fourth Proportional to 715,826, 987,814.70 and 393,533.76

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Solution

The fourth proportional to 715,826, 987,814.70 and 393,533.76 is: 543,062.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,826 : 987,814.70 = 393,533.76 : x
  2. Step 2: Convert to fraction form
    715,826/987,814.70 = 393,533.76/x
  3. Step 3: Cross multiply
    715,826x = 987,814.70 × 393,533.76
  4. Step 4: Simplify right side
    715,826x = 388,738,433,074.27
  5. Step 5: Solve for x
    x = 388,738,433,074.27/715,826
  6. Step 6: Final answer
    x = 543,062.75

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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.