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Finding the Fourth Proportional to 715,988.32, 988,089.30 and 393,722.93

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Solution

The fourth proportional to 715,988.32, 988,089.30 and 393,722.93 is: 543,351.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,988.32 : 988,089.30 = 393,722.93 : x
  2. Step 2: Convert to fraction form
    715,988.32/988,089.30 = 393,722.93/x
  3. Step 3: Cross multiply
    715,988.32x = 988,089.30 × 393,722.93
  4. Step 4: Simplify right side
    715,988.32x = 389,033,414,297.65
  5. Step 5: Solve for x
    x = 389,033,414,297.65/715,988.32
  6. Step 6: Final answer
    x = 543,351.62

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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.