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Finding the Fourth Proportional to 518,912.72, 778,593.88 and 278,746.40

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Solution

The fourth proportional to 518,912.72, 778,593.88 and 278,746.40 is: 418,240.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,912.72 : 778,593.88 = 278,746.40 : x
  2. Step 2: Convert to fraction form
    518,912.72/778,593.88 = 278,746.40/x
  3. Step 3: Cross multiply
    518,912.72x = 778,593.88 × 278,746.40
  4. Step 4: Simplify right side
    518,912.72x = 217,030,242,361.65
  5. Step 5: Solve for x
    x = 217,030,242,361.65/518,912.72
  6. Step 6: Final answer
    x = 418,240.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.