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Finding the Fourth Proportional to 715,267, 987,033.18 and 428,731.48

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Solution

The fourth proportional to 715,267, 987,033.18 and 428,731.48 is: 591,628.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,267 : 987,033.18 = 428,731.48 : x
  2. Step 2: Convert to fraction form
    715,267/987,033.18 = 428,731.48/x
  3. Step 3: Cross multiply
    715,267x = 987,033.18 × 428,731.48
  4. Step 4: Simplify right side
    715,267x = 423,172,196,070.51
  5. Step 5: Solve for x
    x = 423,172,196,070.51/715,267
  6. Step 6: Final answer
    x = 591,628.30

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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.