Home / 715,829.15-987,849.89-389,142.09

Finding the Fourth Proportional to 715,829.15, 987,849.89 and 389,142.09

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Solution

The fourth proportional to 715,829.15, 987,849.89 and 389,142.09 is: 537,019.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,829.15 : 987,849.89 = 389,142.09 : x
  2. Step 2: Convert to fraction form
    715,829.15/987,849.89 = 389,142.09/x
  3. Step 3: Cross multiply
    715,829.15x = 987,849.89 × 389,142.09
  4. Step 4: Simplify right side
    715,829.15x = 384,413,970,800.87
  5. Step 5: Solve for x
    x = 384,413,970,800.87/715,829.15
  6. Step 6: Final answer
    x = 537,019.16

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1.5x scale

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.