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Finding the Fourth Proportional to 715,831, 987,821.60 and 393,538.76

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Solution

The fourth proportional to 715,831, 987,821.60 and 393,538.76 is: 543,069.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,831 : 987,821.60 = 393,538.76 : x
  2. Step 2: Convert to fraction form
    715,831/987,821.60 = 393,538.76/x
  3. Step 3: Cross multiply
    715,831x = 987,821.60 × 393,538.76
  4. Step 4: Simplify right side
    715,831x = 388,746,087,565.22
  5. Step 5: Solve for x
    x = 388,746,087,565.22/715,831
  6. Step 6: Final answer
    x = 543,069.65

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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.