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Finding the Fourth Proportional to 894.78, 1,342.20 and 317.70

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Solution

The fourth proportional to 894.78, 1,342.20 and 317.70 is: 476.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    894.78 : 1,342.20 = 317.70 : x
  2. Step 2: Convert to fraction form
    894.78/1,342.20 = 317.70/x
  3. Step 3: Cross multiply
    894.78x = 1,342.20 × 317.70
  4. Step 4: Simplify right side
    894.78x = 426,416.94
  5. Step 5: Solve for x
    x = 426,416.94/894.78
  6. Step 6: Final answer
    x = 476.56

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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.