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Finding the Fourth Proportional to 715,839, 987,832.64 and 393,546.76

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Solution

The fourth proportional to 715,839, 987,832.64 and 393,546.76 is: 543,080.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,839 : 987,832.64 = 393,546.76 : x
  2. Step 2: Convert to fraction form
    715,839/987,832.64 = 393,546.76/x
  3. Step 3: Cross multiply
    715,839x = 987,832.64 × 393,546.76
  4. Step 4: Simplify right side
    715,839x = 388,758,334,894.25
  5. Step 5: Solve for x
    x = 388,758,334,894.25/715,839
  6. Step 6: Final answer
    x = 543,080.69

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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.