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Finding the Fourth Proportional to 715,696.16, 987,649.64 and 393,399.36

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Solution

The fourth proportional to 715,696.16, 987,649.64 and 393,399.36 is: 542,885.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,696.16 : 987,649.64 = 393,399.36 : x
  2. Step 2: Convert to fraction form
    715,696.16/987,649.64 = 393,399.36/x
  3. Step 3: Cross multiply
    715,696.16x = 987,649.64 × 393,399.36
  4. Step 4: Simplify right side
    715,696.16x = 388,540,736,280.23
  5. Step 5: Solve for x
    x = 388,540,736,280.23/715,696.16
  6. Step 6: Final answer
    x = 542,885.04

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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.