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Finding the Fourth Proportional to 715,931.64, 987,986.46 and 393,647.16

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Solution

The fourth proportional to 715,931.64, 987,986.46 and 393,647.16 is: 543,233.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,931.64 : 987,986.46 = 393,647.16 : x
  2. Step 2: Convert to fraction form
    715,931.64/987,986.46 = 393,647.16/x
  3. Step 3: Cross multiply
    715,931.64x = 987,986.46 × 393,647.16
  4. Step 4: Simplify right side
    715,931.64x = 388,918,064,097.45
  5. Step 5: Solve for x
    x = 388,918,064,097.45/715,931.64
  6. Step 6: Final answer
    x = 543,233.52

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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.