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Finding the Fourth Proportional to 781.78, 1,078.99 and 467.06

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Solution

The fourth proportional to 781.78, 1,078.99 and 467.06 is: 644.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.78 : 1,078.99 = 467.06 : x
  2. Step 2: Convert to fraction form
    781.78/1,078.99 = 467.06/x
  3. Step 3: Cross multiply
    781.78x = 1,078.99 × 467.06
  4. Step 4: Simplify right side
    781.78x = 503,946.51
  5. Step 5: Solve for x
    x = 503,946.51/781.78
  6. Step 6: Final answer
    x = 644.62

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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.