Home / 687,267,257.72-948,428,970.06-378,217,913.72

Finding the Fourth Proportional to 687,267,257.72, 948,428,970.06 and 378,217,913.72

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Solution

The fourth proportional to 687,267,257.72, 948,428,970.06 and 378,217,913.72 is: 521,940,805.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,267,257.72 : 948,428,970.06 = 378,217,913.72 : x
  2. Step 2: Convert to fraction form
    687,267,257.72/948,428,970.06 = 378,217,913.72/x
  3. Step 3: Cross multiply
    687,267,257.72x = 948,428,970.06 × 378,217,913.72
  4. Step 4: Simplify right side
    687,267,257.72x = 358,712,826,367,701,568
  5. Step 5: Solve for x
    x = 358,712,826,367,701,568/687,267,257.72
  6. Step 6: Final answer
    x = 521,940,805.91

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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.