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Finding the Fourth Proportional to 715,999.66, 988,052.97 and 393,690.58

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Solution

The fourth proportional to 715,999.66, 988,052.97 and 393,690.58 is: 543,278.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,999.66 : 988,052.97 = 393,690.58 : x
  2. Step 2: Convert to fraction form
    715,999.66/988,052.97 = 393,690.58/x
  3. Step 3: Cross multiply
    715,999.66x = 988,052.97 × 393,690.58
  4. Step 4: Simplify right side
    715,999.66x = 388,987,146,830.02
  5. Step 5: Solve for x
    x = 388,987,146,830.02/715,999.66
  6. Step 6: Final answer
    x = 543,278.40

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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.