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Finding the Fourth Proportional to 715,930.66, 987,957.75 and 393,621.58

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Solution

The fourth proportional to 715,930.66, 987,957.75 and 393,621.58 is: 543,183.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,930.66 : 987,957.75 = 393,621.58 : x
  2. Step 2: Convert to fraction form
    715,930.66/987,957.75 = 393,621.58/x
  3. Step 3: Cross multiply
    715,930.66x = 987,957.75 × 393,621.58
  4. Step 4: Simplify right side
    715,930.66x = 388,881,490,528.25
  5. Step 5: Solve for x
    x = 388,881,490,528.25/715,930.66
  6. Step 6: Final answer
    x = 543,183.18

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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.