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Finding the Fourth Proportional to 715,712.19, 987,689.44 and 389,025.97

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Solution

The fourth proportional to 715,712.19, 987,689.44 and 389,025.97 is: 536,859.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,712.19 : 987,689.44 = 389,025.97 : x
  2. Step 2: Convert to fraction form
    715,712.19/987,689.44 = 389,025.97/x
  3. Step 3: Cross multiply
    715,712.19x = 987,689.44 × 389,025.97
  4. Step 4: Simplify right side
    715,712.19x = 384,236,846,756.99
  5. Step 5: Solve for x
    x = 384,236,846,756.99/715,712.19
  6. Step 6: Final answer
    x = 536,859.44

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Double scale
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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.