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Finding the Fourth Proportional to 715,967.87, 988,039.31 and 393,698.84

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Solution

The fourth proportional to 715,967.87, 988,039.31 and 393,698.84 is: 543,306.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,967.87 : 988,039.31 = 393,698.84 : x
  2. Step 2: Convert to fraction form
    715,967.87/988,039.31 = 393,698.84/x
  3. Step 3: Cross multiply
    715,967.87x = 988,039.31 × 393,698.84
  4. Step 4: Simplify right side
    715,967.87x = 388,989,923,312.71
  5. Step 5: Solve for x
    x = 388,989,923,312.71/715,967.87
  6. Step 6: Final answer
    x = 543,306.40

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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.