Home / 715,868.20-987,904.50-389,181.88

Finding the Fourth Proportional to 715,868.20, 987,904.50 and 389,181.88

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Solution

The fourth proportional to 715,868.20, 987,904.50 and 389,181.88 is: 537,074.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,868.20 : 987,904.50 = 389,181.88 : x
  2. Step 2: Convert to fraction form
    715,868.20/987,904.50 = 389,181.88/x
  3. Step 3: Cross multiply
    715,868.20x = 987,904.50 × 389,181.88
  4. Step 4: Simplify right side
    715,868.20x = 384,474,530,570.46
  5. Step 5: Solve for x
    x = 384,474,530,570.46/715,868.20
  6. Step 6: Final answer
    x = 537,074.47

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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.