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Finding the Fourth Proportional to 698.78, 1,047.78 and 479.66

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Solution

The fourth proportional to 698.78, 1,047.78 and 479.66 is: 719.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.78 : 1,047.78 = 479.66 : x
  2. Step 2: Convert to fraction form
    698.78/1,047.78 = 479.66/x
  3. Step 3: Cross multiply
    698.78x = 1,047.78 × 479.66
  4. Step 4: Simplify right side
    698.78x = 502,578.15
  5. Step 5: Solve for x
    x = 502,578.15/698.78
  6. Step 6: Final answer
    x = 719.22

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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.